The HFP profile does not support MUTE feature. Please find the description of AT+VGM command as per the HFP specification.
Syntax: AT+VGM=<gain> Description: This command is issued by the HF device to report its current microphone gain level setting to the AG (phone). <gain> is a decimal numeric constant, relating to a particular (implementation dependent) volume level controlled by the HF device. *This command does not change the microphone gain of the AG; it simply indicates the current value of the microphone gain in the HF device*. Values: <gain>: 0 -15, entered as integer values, where 0 = Minimum gain [It does not mean mite but just that this is min mic gain] 15 = Maximum gain So how does HF device implement the mute feature? When user enables mute during a call from HF device (by pressing some key/s on the HF device), the HF device simply cuts the mic input (typically setting the mic gain to zero), and only silence goes to the AG and then to the remote device. As AG+VGM=0 does not mean any thing to AG, it cannot assume that mute is enabled by HF. Hence when you enable mute from HF, you must unmute from HF. On Sat, Sep 25, 2010 at 8:41 PM, Pavan Savoy <pavan.sa...@gmail.com> wrote: > HFP can support mute right? among voice dialing, redialing etc.? isn't this > what makes hfp different from hsp? > in any case i was interested to know how the sco connection was > established? via the android gui or via some test application? > > On Sat, Sep 25, 2010 at 2:13 AM, Suresh Chandra Pal < > sureshchandra...@gmail.com> wrote: > >> Guys, >> This is a little bit confusing for me. I wonder that HSP/HFP supports mute >> from Headset device. Please correct me if I am wrong. >> >> >> >> On Fri, Sep 24, 2010 at 12:49 PM, Pavan Savoy <pavan.sa...@gmail.com>wrote: >> >>> Hi .. >>> >>> Do you happen to have a development platform with modem on it? >>> I am interested to know how you managed to connect to HSP/HFP from UI if >>> you don't have a modem? >>> or do you have a modem ? >>> >>> >>> >>> On Thu, Sep 23, 2010 at 10:05 AM, guru <guru.nav...@gmail.com> wrote: >>> >>>> Hi All, >>>> >>>> I connected Handsfree (HF) device to android phone, and received the >>>> incoming call. While in the call i tried to mute the call, it is >>>> getting mute but on GUI the mute icon is not getting changed. It is in >>>> unmute condition only. >>>> >>>> When I discussed this, what I got is >>>> >>>> HF will communicate using AT commands AT+VGM=0 to mute telephony >>>> modem and if i mute from GUI it will mute the micro phone. >>>> >>>> so If we mute from HF we have to unmute from HF itself. >>>> >>>> Please let me know the behavior? >>>> >>>> -- >>>> unsubscribe: >>>> android-porting+unsubscr...@googlegroups.com<android-porting%2bunsubscr...@googlegroups.com> >>>> website: http://groups.google.com/group/android-porting >>>> >>> >>> >>> >>> -- >>> --Pavan Savoy >>> >>> >>> -- >>> unsubscribe: >>> android-porting+unsubscr...@googlegroups.com<android-porting%2bunsubscr...@googlegroups.com> >>> website: http://groups.google.com/group/android-porting >>> >> >> > > > -- > --Pavan Savoy > > -- > unsubscribe: > android-porting+unsubscr...@googlegroups.com<android-porting%2bunsubscr...@googlegroups.com> > website: http://groups.google.com/group/android-porting > -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
