BLUETOOTH DOC
`Prepared
`Car Working Group
`
`
`
`Approved
`Date / Year-Month-Day
`Adopted
`2005-11-25
`e-mail address
`car-feedback@bluetooth.org
`
`Revision
`V10r00
`
`Document No
`HFP1.5_SPEC
`N.B.
`
`
`HANDS-FREE PROFILE 1.5
`
`Abstract
`
`The Hands-Free Profile (HFP) 1.5 specification defines the minimum
`set of functions such that a Mobile Phone can be used in conjunction
`with a Hands-Free device (e.g. installed in the car or represented by
`a wearable device such as a headset), with a Bluetooth® Link
`providing a wireless means for both remote control of the Mobile
`Phone by the Hands-Free device and voice connections between the
`Mobile Phone and the Hands-Free device.
`
`Compliance with this specification assures interoperability between a
`Bluetooth enabled Hands-Free device and any Bluetooth equipped
`Mobile Phone supporting this profile.
`
`
`
`
`
`Ex. 1028
`Page 01 of 93
`
`

`

`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`
`Page 2 of 93
`
`Revision History
`Comments
`Revision Number Date
`01-01-2912-11-2003 Hands-Free Profile 0.50 published1st draft for SubWG12
`RC10.50
`Review
`22-11-200403-14-03 CR document derived from FIPD07r04Additional
`comments from BTI/BQRB reviews
`Editing for Prototyping Specification standards
`Incorporated Prototyping Specifications
`Errata and corrections from IOP.
`
`16-02-2005
`19-03-2005
`22-04-2005
`
`RC21.00m VD
`
`D10r08
`D12r00
`D12r01
`
`D12r02
`
`D15r03
`
`D15r04
`D15r05
`D15r06
`
`D15r07
`
`D15r08
`D15r09
`D15r09
`
`D15r10-11
`
`D15r12
`D15r13
`V10r00
`
`28-04-2005
`
`13-05-2005
`
`27-05-2005
`07-06-2005
`07-18-2005
`
`08-01-2005
`
`09/02/2005
`09/22/2005
`09/26/2005
`
`10/04/2005
`
`10/05/2005
`10/07/2005
`11/25/2005
`
`HFP 1.0 Errata- 13, 261, 317, 549, 550, 575, 586, 635,
`706, 731, 746
`Correct formatting problems and comments from review.
`
`Errata 819, 820, 821, 822
`Edits from BARB Review. Errata 823.
`
`Changes from BARB review. Editorial changes for
`language and readability.
`Comments from BTI/BARB review.
`
`Comments from BTI review.
`Comments from BTI review
`
`Add 3GPP 27.07 version and remove reference to Call
`Waiting for AT+CHUP
`BTI Comments
`
`Editorial changes
`Prepare for publication
`Adopted by the Bluetooth Board of Directors
`
`25 November 2005
`
`Ex. 1028
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`
`

`

`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`
`Page 3 of 93
`
`Contributors
`Name
`Aaron WEINFIELD
`Basam MASRI
`Don LIECHTY
`
`Stephen RAXTER
`Vartika AGARWAL
`Leonard HINDS
`
`Burch SEYMOUR
`Stephane BOUET
`Jamie MCHARDY
`Jurgen SCHNITZLER
`
`Guillaume POUJADE
`Dmitri TOROPOV
`Erwin WEINANS
`
`Tim REILLY
`Akira MIYAJIMA
`Ryan BRUNER
`
`Scott WALSH
`Patrick CLAUBERG
`Neil MACMULLEN
`
`Michael BUNTSCHECK
`Florencio CEBALLOS
`Bill BERNARD
`
`
`
`Company
`Denso
`Denso
`Extended Systems
`
`Johnson Controls
`Motorola
`Motorola
`
`Motorola
`Nissan
`Nokia
`Nokia
`
`Parrot
`Siemens
`Sony Ericsson
`
`Stonestreet One
`Toyota
`Visteon
`
`Plantronics
`Nokia
`CSR
`
`BMS
`Visteon
`Visteon
`
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`

`

`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`
`Page 4 of 93
`
`Disclaimer and Copyright Notice
`The copyright in this specification is owned by the Promoter Members of Bluetooth® Special Interest
`Group (SIG), Inc. (“Bluetooth SIG”). Use of these specifications and any related intellectual property
`(collectively, the “Specification”), is governed by the Promoters Membership Agreement among the
`Promoter Members and Bluetooth SIG (the “Promoters Agreement”), certain membership agreements
`between Bluetooth SIG and its Adopter and Associate Members (the “Membership Agreements”) and the
`Bluetooth Specification Early Adopters Agreements (1.2 Early Adopters Agreements) among Early
`Adopter members of the unincorporated Bluetooth SIG and the Promoter Members (the “Early Adopters
`Agreement”). Certain rights and obligations of the Promoter Members under the Early Adopters
`Agreements have been assigned to Bluetooth SIG by the Promoter Members.
`
`Use of the Specification by anyone who is not a member of Bluetooth SIG or a party to an Early Adopters
`Agreement (each such person or party, a “Member”), is prohibited. The legal rights and obligations of
`each Member are governed by their applicable Membership Agreement, Early Adopters Agreement or
`Promoters Agreement. No license, express or implied, by estoppel or otherwise, to any intellectual
`property rights are granted herein.
`
`Any use of the Specification not in compliance with the terms of the applicable Membership Agreement,
`Early Adopters Agreement or Promoters Agreement is prohibited and any such prohibited use may result
`in termination of the applicable Membership Agreement or Early Adopters Agreement and other liability
`permitted by the applicable agreement or by applicable law to Bluetooth SIG or any of its members for
`patent, copyright and/or trademark infringement.
`
`THE SPECIFICATION IS PROVIDED “AS IS” WITH NO WARRANTIES WHATSOEVER, INCLUDING
`ANY WARRANTY OF MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR
`PURPOSE, SATISFACTORY QUALITY, OR REASONABLE SKILL OR CARE, OR ANY WARRANTY
`ARISING OUT OF ANY COURSE OF DEALING, USAGE, TRADE PRACTICE, PROPOSAL,
`SPECIFICATION OR SAMPLE.
`
`Each Member hereby acknowledges that products equipped with the Bluetooth technology ("Bluetooth
`products") may be subject to various regulatory controls under the laws and regulations of various
`governments worldwide. Such laws and regulatory controls may govern, among other things, the
`combination, operation, use, implementation and distribution of Bluetooth products. Examples of such
`laws and regulatory controls include, but are not limited to, airline regulatory controls, telecommunications
`regulations, technology transfer controls and health and safety regulations. Each Member is solely
`responsible for the compliance by their Bluetooth Products with any such laws and regulations and for
`obtaining any and all required authorizations, permits, or licenses for their Bluetooth products related to
`such regulations within the applicable jurisdictions. Each Member acknowledges that nothing in the
`Specification provides any information or assistance in connection with securing such compliance,
`authorizations or licenses. NOTHING IN THE SPECIFICATION CREATES ANY WARRANTIES,
`EITHER EXPRESS OR IMPLIED, REGARDING SUCH LAWS OR REGULATIONS.
`
`ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS OR FOR
`NONCOMPLIANCE WITH LAWS, RELATING TO USE OF THE SPECIFICATION IS EXPRESSLY DISCLAIMED. BY USE OF
`THE SPECIFICATION, EACH MEMBER EXPRESSLY WAIVES ANY CLAIM AGAINST BLUETOOTH SIG AND ITS PROMOTER
`MEMBERS RELATED TO USE OF THE SPECIFICATION.
`
`Bluetooth SIG reserve the right to adopt any changes or alterations to the Specification as it deems
`necessary or appropriate.
`
`Copyright © 2001, 2002, 2003, 2004, 2005. Bluetooth SIG Inc. All copyrights in the Bluetooth
`Specifications themselves are owned by Agere Systems Inc., Ericsson Technology Licensing AB, IBM
`Corporation, Intel Corporation, Microsoft Corporation, Motorola, Inc., Nokia Mobile Phones and Toshiba
`Corporation. *Other third-party brands and names are the property of their respective owners.
`
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`

`

`2
`
`3
`4
`
`4.1
`4.2
`
`Page 5 of 93
`
`1.1
`1.2
`1.3
`
`2.1
`2.2
`2.3
`2.4
`2.5
`
`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`Contents
`1
`Introduction ...................................................................................................................................... 7
`Scope......................................................................................................................................... 7
`Profile Dependencies ................................................................................................................ 8
`Symbols and Conventions......................................................................................................... 8
`1.3.1 Requirement Status Symbols ............................................................................................. 8
`1.3.2 Naming Conventions........................................................................................................... 9
`1.3.3 Signaling Diagram Conventions........................................................................................ 10
`Profile Overview ............................................................................................................................. 11
`Protocol Stack.......................................................................................................................... 11
`Configuration and Roles .......................................................................................................... 11
`User Requirements and Scenarios ......................................................................................... 12
`Profile Fundamentals............................................................................................................... 12
`Conformance ........................................................................................................................... 13
`Application layer............................................................................................................................. 14
`Hands-Free Control Interoperability Requirements ....................................................................... 17
`Introduction.............................................................................................................................. 17
`Service Level Connection Establishment ................................................................................ 17
`4.2.1 Service Level Connection Initialization ............................................................................. 17
`4.2.2 Link Loss Recovery........................................................................................................... 20
`Service Level Connection Release ......................................................................................... 20
`4.3
`Transfer of Registration Status................................................................................................ 21
`4.4
`Transfer of Signal Strength Indication ..................................................................................... 21
`4.5
`Transfer of Roaming Status Indication .................................................................................... 22
`4.6
`Transfer of Battery Level Indication of AG .............................................................................. 23
`4.7
`Query Operator Selection........................................................................................................ 23
`4.8
`Report Extended Audio Gateway Error Results Code ............................................................ 24
`4.9
`Transfer of Call, Call Setup and Held Call Status ................................................................... 25
`4.10
`Audio Connection Setup.......................................................................................................... 25
`4.11
`Audio Connection Release...................................................................................................... 26
`4.12
`Answer an Incoming Call......................................................................................................... 27
`4.13
`4.13.1 Answer Incoming Call from the HF – In-Band Ringing ..................................................... 27
`4.13.2 Answer Incoming Call from the HF – No In-Band Ringing................................................ 28
`4.13.3 Answer Incoming Call from the AG................................................................................... 29
`4.13.4 Change the In-Band Ring Tone Setting............................................................................ 30
`4.14 Reject an Incoming Call........................................................................................................... 31
`4.14.1 Reject an Incoming Call from the HF................................................................................ 31
`4.14.2 Rejection/Interruption of an Incoming Call in the AG........................................................ 32
`4.15
`Terminate a Call Process ........................................................................................................ 33
`4.15.1 Terminate a Call Process from the HF.............................................................................. 33
`4.15.2 Terminate a Call Process from the AG ............................................................................. 33
`4.16
`Audio Connection Transfer Towards the HF........................................................................... 34
`4.17
`Audio Connection Transfer Towards the AG........................................................................... 35
`4.18
`Place a Call With the Phone Number Supplied by the HF ...................................................... 36
`4.19 Memory Dialing from the HF.................................................................................................... 37
`4.20
`Last Number Re-Dial from the HF........................................................................................... 38
`4.21 Call Waiting Notification Activation.......................................................................................... 40
`4.22
`Three Way Call Handling......................................................................................................... 41
`4.22.1 Three Way Calling—Call Waiting Notification................................................................... 43
`4.22.2 Three Way Calls – Third Party Call Placed from the HF .................................................. 44
`4.23 Calling Line Identification (CLI) Notification............................................................................. 45
`4.24
`The HF Requests Turning Off the AG’s EC and NR ............................................................... 45
`4.25
`Voice Recognition Activation................................................................................................... 46
`4.25.1 Voice Recognition Activation – HF Initiated...................................................................... 47
`4.25.2 Voice Recognition Activation – AG Initiated ..................................................................... 48
`
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`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`4.25.3 Voice Recognition Deactivation ........................................................................................ 48
`4.26
`Attach a Phone Number to a Voice Tag.................................................................................. 49
`4.27
`Transmit DTMF Codes ............................................................................................................ 50
`4.28 Remote Audio Volume Control................................................................................................ 50
`4.28.1 Audio Volume Control ....................................................................................................... 50
`4.28.2 Volume Level Synchronization.......................................................................................... 51
`4.29 Response and Hold ................................................................................................................. 53
`4.29.1 Query Response and Hold Status .................................................................................... 53
`4.29.2 Put an Incoming Call on Hold from HF ............................................................................. 54
`4.29.3 Put an Incoming Call on Hold from AG............................................................................. 55
`4.29.4 Accept a Held Incoming Call from HF............................................................................... 56
`4.29.5 Accept a Held Incoming Call from AG .............................................................................. 57
`4.29.6 Reject a Held Incoming Call from HF................................................................................ 57
`4.29.7 Reject a Held Incoming Call from AG ............................................................................... 58
`4.29.8 Held Incoming Call Terminated by Caller ......................................................................... 60
`4.30
`Subscriber Number Information............................................................................................... 61
`4.31
`Enhanced Call Status Indications............................................................................................ 62
`4.31.1 Query List of Current Calls in AG...................................................................................... 62
`4.31.2 Indication of Status for Held Calls..................................................................................... 62
`4.32
`Enhanced Call Control Mechanisms ....................................................................................... 65
`4.32.1 Release Specified Call Index ............................................................................................ 65
`4.32.2 Private Consultation Mode................................................................................................ 66
`4.33
`AT Command and Results Codes........................................................................................... 66
`4.33.1 General ............................................................................................................................. 66
`4.33.2 AT Capabilities Re-Used from GSM 07.07 and 3GPP 27.007 ......................................... 67
`4.33.3 Bluetooth Defined AT Capabilities .................................................................................... 75
`Serial Port Profile ........................................................................................................................... 81
`RFCOMM Interoperability Requirements ................................................................................ 81
`L2CAP Interoperability Requirements ..................................................................................... 81
`SDP Interoperability Requirements ......................................................................................... 81
`5.3.1
`Interaction with Hands-Free Profile Rev 0.96 Implementations ....................................... 84
`Link Manager (LM) Interoperability Requirements .................................................................. 84
`Link Control (LC) Interoperability Requirements ..................................................................... 85
`5.5.1 Class of Device ................................................................................................................. 85
`Synchronous Connection Interoperability Requirements ........................................................ 86
`Generic Access Profile................................................................................................................... 88
`Modes ...................................................................................................................................... 88
`Security Aspects...................................................................................................................... 88
`Idle Mode Procedures ............................................................................................................. 88
`References..................................................................................................................................... 89
`List of Acronyms and Abbreviations............................................................................................... 90
`List of Figures................................................................................................................................. 91
`List of Tables.................................................................................................................................. 93
`
`5.1
`5.2
`5.3
`5.4
`5.5
`5.6
`6.1
`6.2
`6.3
`
`Page 6 of 93
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`5
`
`6
`
`7
`8
`9
`10
`
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`

`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`
`Page 7 of 93
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`1 Introduction
`1.1 Scope
`This document defines the protocols and procedures that shall be used by devices
`implementing the Hands-Free Profile. The most common examples of such devices are
`in-car Hands-Free units used together with cellular phones, or wearable wireless
`headsets.
`The profile defines how two devices supporting the Hands-Free Profile shall interact
`with each other on a point-to-point basis.
`An implementation of the Hands-Free Profile typically enables a headset, or an
`embedded Hands-Free unit to connect, wirelessly, to a cellular phone for the purposes
`of acting as the cellular phone’s audio input and output mechanism and allowing typical
`telephony functions to be performed without access to the actual phone.
`
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`Hands-Free Profile (HFP) 1.5
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`Page 8 of 93
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`1.2 Profile Dependencies
`In Figure 1.1, the Bluetooth profile structure and the dependencies of the profiles are
`depicted. A profile is dependent upon another profile if it re-uses parts of that profile, by
`explicitly referencing it. Dependency is illustrated in the figure below.
`
`
`Generic Access Profile
`
`TCS Binary based profiles
`Cordless
`Telephony Profile
`
`Intercom Profile
`
`Service Discovery
`Application Profile
`
`Serial Port Profile
`
`Dial-up Networking
`Profile
`
`Fax Profile
`
`Headset Profile
`
`Generic Object Exchange
`Profile
`
`File Transfer
`Profile
`
`Object Push Profile
`
`Synchronization
`Profile
`
`Hands-Free Profile
`
`SIM Access Profile
`
`
`
`Figure 1.1: Bluetooth Profiles
`As indicated in the figure, the Hands-Free Profile is dependent upon both the Serial Port
`Profile [5] and the Generic Access Profile [4]. Details are provided in Sections 5 (Serial
`Port Profile) and 6 (Generic Access Profile).
`1.3 Symbols and Conventions
`1.3.1 Requirement Status Symbols
`In this document, the following symbols are used:
`"M" for mandatory to support
`•
`•
`"O" for optional to support
`•
`"X" for excluded (used for capabilities that may be supported by the device, but the
`Hands-Free Profile shall not use these capabilities)
`
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`

`

`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`
`Page 9 of 93
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`"C" for conditional to support
`•
`"N/A" for not applicable (in the given context this capability is not defined)
`•
`Some capabilities or features (identified as “X”), mandated according to the relevant
`Bluetooth specifications, are excluded with respect to this profile because they may
`degrade the operation of devices in the particular use case. Therefore, features or
`capabilities labeled “X” shall never be activated while operating in a use case where
`they are labeled as such.
`
`1.3.2 Naming Conventions
`In this document, the following naming conventions are used:
`• Where “Core Specification” is said it refers to the Bluetooth Core Specification 1.1 or
`later adopted by the Bluetooth® SIG.
`• Where “LMP link” is said, it means a Link Manager (LM) level link over which only
`Link Manager Protocol (LMP) commands are conveyed.
`• Where “RFCOMM connection” is said, it means the presence of a virtual serial port
`as specified in [5].
`• Where “Service Level Connection” is said, it means a synchronized high-level
`protocol connection involving a portion of the protocol stack. In this specific case, it
`refers to the presence of a RFCOMM connection, and assumes that the HF has
`synchronized itself to the state of the AG using the specified Service Level
`Connection initialization procedure.
`• Where “Service Level Connection initialization” is said, it means the execution of the
`set of AT commands and responses specified by the profile necessary to
`synchronize the state of the HF with that of the AG.
`• Where “Service Level Connection establishment” is said, it means the combined
`process of establishing the RFCOMM connection, as well as the necessary device
`synchronization using Service Level Connection initialization.
`• Where “Synchronous Connection” is said, it means a SCO or eSCO logical link
`intended for supporting a full duplex Audio Connection.
`• Where “Audio Connection” is said, it means a Synchronous Connection including the
`means to provide a complete audio path between two devices assuming roles within
`this profile.
`• Where “incoming call” is said, it means a call connection in the direction “Phone
`Network=>AG”, such that it is initiated by the Network to which the AG is attached.
`• Where ‘outgoing call’ is said, it means a call connection in the direction ”AG=>Phone
`Network”, such that it is initiated by the AG towards the Network to which it is
`attached.
`
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`1.3.3 Signaling Diagram Conventions
`The signaling diagrams in this specification are informative only. Within the diagrams,
`the following conventions are used to describe procedures:
`
`A
`
`B
`
`Mandatory signal sent by A
`
`Optional signal sent by B
`
`Mandatory procedure initiated by B
`
`Optional procedure initiated by A
`
`Mandatory procedure initiated by either A or B
`
`Optional procedure initiated by either A or B
`
`Current state/condition
`
`Optional state/condition
`
`Figure 1.2: Conventions used in signaling diagrams
`
`
`
`
`
`
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`2 Profile Overview
`2.1 Protocol Stack
`The figure below shows the protocols and entities used in this profile.
`Application
`Application
`(Audio port emulation)
`(Audio driver)
`
`Hands-Free control
`
`Hands-Free control
`
`RFCOMM
`
`SDP
`
`RFCOMM
`
`SDP
`
`LMP
`
`L2CAP
`
`LMP
`
`L2CAP
`
`Baseband
`
`Baseband
`
`
`
`Hands-Free side
`
`Audio Gateway side
`Figure 2.1: Protocol stack
`The Baseband, LMP and L2CAP are the OSI layer 1 and 2 Bluetooth protocols.
`RFCOMM is the Bluetooth serial port emulation entity. SDP is the Bluetooth Service
`Discovery Protocol. See [1] for more details on these topics.
`Compatibility to v1.1 or later Core Specification is required.
`Hands-Free control is the entity responsible for Hands-Free unit specific control
`signaling; this signaling is AT command based.
`Although not shown in the model above, it is assumed by this profile that Hands-Free
`Control has access to some lower layer procedures (for example, Synchronous
`Connection establishment).
`The audio port emulation layer shown in Figure 2.1 is the entity emulating the audio port
`on the Audio Gateway, and the audio driver is the driver software in the Hands-Free
`unit.
`For the shaded protocols/entities in Figure 2.1, the Serial Port Profile [5] is used as the
`base standard. For these protocols, all mandatory requirements stated in the Serial Port
`Profile apply except in those cases where this specification explicitly states deviations.
`2.2 Configuration and Roles
`Figure 2.2 below shows typical configurations of devices for which the Hands-Free
`Profile is applicable:
`
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`BLUETOOTH SPECIFICATION
`Hands-Free Profile (HFP) 1.5
`
`
`Simple Headset
`
`Page 12 of 93
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`Bluetooth
`Connection
`
`OR
`
`Cellular
`Connection
`
`Public
`Wireless
`Network
`
`Hands-Free
`unit installed
`in the car
`
`
`
`Figure 2.2: Typical Hands-Free Use
`The following roles are defined for this profile:
`Audio Gateway (AG) – This is the device that is the gateway of the audio, both for
`input and output. Typical devices acting as Audio Gateways are cellular phones.
`Hands-Free unit (HF) – This is the device acting as the Audio Gateway’s remote audio
`input and output mechanism. It also provides some remote control means.
`These terms are used in the rest of this document to designate these roles.
`2.3 User Requirements and Scenarios
`The following rules apply to this profile:
`a) The profile states the mandatory and optional features when the “Hands-Free
`Profile” is active in the Audio Gateway and the Hands-Free unit.
`b) The profile mandates the usage of CVSD for transmission of audio (over the
`Bluetooth link). The resulting audio is monophonic, with a quality that, under normal
`circumstances, does not have perceived audio degradation.
`c) Between the Hands-Free unit and the Audio Gateway, only one Audio Connection
`per Service Level Connection at a time is supported.
`d) Both the Audio Gateway and the Hands-Free unit may initiate Audio Connection
`establishment and release. Valid speech data shall exist on the Synchronous
`Connection in both directions after the Audio Connection is established.
`e) Whenever an “Audio Connection” exists, a related “Service Level Connection” shall
`also exist.
`f) The presence of a “Service Level Connection” shall not imply that an “Audio
`Connection” exists. Releasing a “Service Level Connection” shall also release any
`existing “Audio Connection” related to it.
`2.4 Profile Fundamentals
`Baseband authentication and encryption is optional for both the Hands-Free unit and
`the Audio Gateway. If both devices support authentication and encryption, the
`application on either device may require its use.
`
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`A Hands-Free unit may be able to use the services of the Audio Gateway without the
`creation of a secure connection. It is implementation specific whether the Hands-Free
`unit provides or supports security enforcement for the user.
`Whenever baseband authentication and/or encryption is used, the two devices shall
`create a secure connection using the GAP authentication procedure as described in
`Section 5.1 of the Generic Access Profile [4]. This procedure may include entering a
`Bluetooth PIN code and creation of proper link keys. In cases when the UI of the Hands-
`Free unit is limited, a fixed Bluetooth PIN code may be used during the GAP
`authentication procedure.
`If a LMP link is not already established between the Hands-Free unit and the Audio
`Gateway, the LMP link shall be set up before any other procedure is performed.
`There are no fixed master of slave roles in the profile.
`The Audio Gateway and Hand-Free unit provide serial port emulation. For the serial port
`emulation, RFCOMM (see [1]) is used. The serial port emulation is used to transport the
`user data including modem control signals and AT command from the Hands-Free unit
`to the Audio Gateway. The AT commands are parsed by the Audio Gateway and
`responses are sent to the Hands-Free unit via the Bluetooth serial port connection.
`2.5 Conformance
`If conformance to this profile is claimed, all capabilities indicated as mandatory for this
`profile shall be supported in the specified manner (process mandatory). This also
`applies for all optional and conditional capabilities for which support is indicated. All
`mandatory, optional and conditional capabilities, for which support is indicated, are
`subject to verification as part of the Bluetooth Qualification Program.
`
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`BLUETOOTH SPECIFICATION
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`
`3 Application layer
`This section describes the feature requirements for units complying with Hands-Free
`Profile.
`Table 3.1 below shows the feature requirements for this profile.
`
`Feature
`Support in HF
`1.
`Connection management
`M
`M(note 1)
`2.
`Phone status information
`M
`M
`M
`M
`
`Support in AG
`M
`M
`
`M
`M
`O
`M
`
`M
`M
`M
`
`M
`M
`O(note 3)
`M
`O
`O
`
`O
`M
`O
`
`O
`M
`M
`
`3.
`4
`5.
`6.
`
`7.
`8.
`9.
`
`10.
`11.
`12.
`
`13.
`14.
`15.
`
`16.
`17.
`18.
`
`Audio Connection handling
`Accept an incoming voice call
`Reject an incoming voice call
`Terminate a call
`
`Audio Connection transfer during an ongoing call
`Place a call with a phone number supplied by the HF
`Place a call using memory dialing
`
`M
`O
`O
`
`Place a call to the last number dialed
`Call waiting notification
`Three way calling
`
`Calling Line Identification (CLI)
`Echo canceling (EC) and noise reduction (NR)
`Voice recognition activation
`
`Attach a Phone number to a voice tag
`Ability to transmit DTMF codes
`Remote audio volume control
`
`Respond and Hold
`19.
`Subscriber Number Information
`20.
`21a. Enhanced Call St