How to implement mute functionality in a PJSIP call on iOS - iphone

Question

I wanted to implement Mute button in my call. I am working on a VOIP application for iPhone. Now when a call comes and user picks up, I want to display a Mute button so the user can mute the call or conference. I did the same through the PJSIP API.
-(int) mutethecall
{
pj_status_t status = pjsua_conf_adjust_rx_level (0,0);
status = pjsua_conf_adjust_tx_level (0,0);
return (PJ_SUCCESS == status);
}
-(int) unmutethecall
{
pj_status_t status = pjsua_conf_adjust_rx_level (0,1);
status = pjsua_conf_adjust_tx_level (0,1);
return (PJ_SUCCESS == status);
}
The problem is that while this code is working for one to one call, it's not working for conference scenarios.
I wonder if I could turn off the mic directly: could I implement the same using iOS bypassing the PJSIP API?
Is this possible?

Answer 1

You can completely disconnect the microphone from the conference using pjsua_conf_disconnect and pjsua_conf_connect when you want to unmute.
Here's some Objective-C code that does the trick:
+(void)muteMicrophone
{
#try {
if( pjsipConfAudioId != 0 ) {
NSLog(#"WC_SIPServer microphone disconnected from call");
pjsua_conf_disconnect(0, pjsipConfAudioId);
}
}
#catch (NSException *exception) {
NSLog(#"Unable to mute microphone: %#", exception);
}
}
+(void)unmuteMicrophone
{
#try {
if( pjsipConfAudioId != 0 ) {
NSLog(#"WC_SIPServer microphone reconnected to call");
pjsua_conf_connect(0,pjsipConfAudioId);
}
}
#catch (NSException *exception) {
NSLog(#"Unable to un-mute microphone: %#", exception);
}
}
Note that the pjsipConfAudioID was retrieved when the call was established, again in Objective-C...
static void on_call_state(pjsua_call_id call_id, pjsip_event *e)
{
pjsua_call_info ci;
PJ_UNUSED_ARG(e);
pjsua_call_get_info(call_id, &ci);
pjsipConfAudioId = ci.conf_slot;
...
}
Hope that helps!