iphone - Codec mismatch between asterisk server and my android app? -

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i'm new voip application development. made iphone voip app , android voip app, , can talk friends via voip app. have own asterisk server set on linux operating system.

in making phone voip app, used whichever codec native sip library integrated (in case, linphone sip library). i'm interested in figuring out codec being used. after debugging, android app says i'm using pcmu codec. unusual because in asterisk server sip.conf file, allow ulaw , gsm codecs.

so question is, how come voip app works when there's mismatch in codecs between phone app (using pcmu) , asterisk server (allowing ulaw , gsm)? i'd expect app break because of codec mis-match.

please check answer in other question. note, pcmu=ulaw=g711u. different names


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