MCPC-TR-002 Hands-Free Profile 1.5 Application Guideline ...

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©Copyright 2006-2011 Mobile Computing Promotion Consortium (MCPC)MCPC TR-002 Hands-Free Profile 1.5 Guideline Version 1.51Recommendations for normal / additional sequence (2/2)Item HFP Recommendation Reason- When either the AG or the HF terminatesan incoming call with no in-band ringing viacanceling /rejecting the incoming call, thelocal ring tone should be stopped.It is recommended that the local ring tonebe stopped when the HF receives +CIEV(callsetup=0).Stopping the localring tone whencanceling/rejecting anincoming call (noin-band ringing).To define the timing to stopthe local ring tone in theHF.Stopping the localring tone whenanswering anincoming call fromthe AG- When the AG answers an incoming callwith no in-band ringing, the local ring toneshould be stopped. It is recommended thatthe local ring tone be stopped when the HFreceives +CIEV (callsetup=0).Behavior of theAG when the HFnot supporting 3-way calling- When the HF does not support 3-waycalling, it is recommended that the AGcontrol the HF with regular commandswhich could be understood by the HFTo avoid state mismatchbetween the HF and theAG.Handling of theaudio connectionwhen answering acall from the AG orthe HFHandling of theaudio connectionwhen an incomingcall is put on holdfrom the AG or theHFHandling of theaudio connectionwhen a call is notactive- When the AG answers an incoming call ora held incoming call, it is recommendedthat the audio connection be terminated.When the HF answers an incoming call ora held incoming call, it is recommendedthat the audio connection be established.4.29.3 When the AG puts an incoming call onhold, it is recommended that the audioconnection state be not changed.When the HF puts an incoming call onhold, it is recommended that the audioconnection be established.- When a call is not active, it isrecommended that the audio connection beterminated except the case of voicerecognition activation, AT+BVRA=1 or+BVRA:1.To define how to handle theaudio connection wheneither the AG or the HFanswers a call.To define how to handle theaudio connection wheneither the AG or the HFputs an incoming call onhold.To define how to handle theaudio connection when acall is not active.7
©Copyright 2006-2011 Mobile Computing Promotion Consortium (MCPC)MCPC TR-002 Hands-Free Profile 1.5 Guideline Version 1.514.6 Recommendations for abnormal sequencesRecommendations for abnormal sequencesItem HFP Recommendation ReasonService Level Connectionlink loss during a callService Level Connectionlink loss during an audioconnectionService Level Connectionlink loss during ServiceLevel Connection4.2.3 When the Service Level Connectionlink loss occurs during a call, it isrecommended that the HF try toestablish the new Service LevelConnection [Defined in HFP 4.2.3].(see Note below)- When the Service Level Connectionlink loss occurs during an audioconnection and no call exists, it isrecommended that the HF try toestablish the new Service LevelConnection and the AG wait for theservice level reconnection to completefor the defined time (Twaitslc).- If the Service Level Connection linkloss occurs while no call is active, it isrecommended that the HF initiate theestablishment of the new ServiceLevel Connection.If the Service Level Connection isestablished again, the HF unit shall notbelieve that the Service LevelConnection state from previousconnection is valid.It is recommended that the HF initiatethe Service Level Connectionestablishment procedure (AT+CIND=?etc.).-To re-establish of theaudio connectionfollowing the ServiceLevel Connection linklossTo re-establish theService LevelConnection in the caseof link loss(Note)When Service Level Connection link loss is detected, the AG may take one of the actions below:- Terminate the ongoing call immediately.- Keep the ongoing call active for certain duration. (It is implementation dependant.)(For example, some users may set specific time parameters on the AG, which define theduration until the ongoing call is terminated.)- Maintain the ongoing call.When the new Service Level Connection is established and there is an ongoing call, the AG is responsiblefor choosing whether the call is transferred from the AG to the HF or not. This is left as an implementationchoice for the AG design. (It should be noted that the existing ongoing call is not always the same as thecall before link loss). Following implementations are examples.(1) The ongoing call may be transferred to the HF by user judgment and operation.(2) If the existing ongoing call is same as the one before link loss by AG judgment, the audio connectionmay be transferred to the HF autonomously.- User may choose whether the audio connection is transferred to the HF autonomously or not.8
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