Speaker activation does not work

so far, I have been able to turn on the speaker when using Sinch. I am not sure if this is a bug, or if I am doing something wrong. I had this problem on both iPhone 5S and iPhone 6.

Here is the code I used:

- (void)speaker {
    id <SINAudioController> audio = [self.sinchClient audioController];
    [audio enableSpeaker];
}

      

        
        
        
      

    

And this is where it gets called from:

- (void)callDidEstablish:(id<SINCall>)call;
{
    DDLogVerbose(@"Call did establish");

    // Set speaker and mute
    [self mute];
    [self speaker];
}