Audio issues on iOS prevent using JsSIP to initiate calls

[pjkundert]

Has anyone investigated where JsSIP fails, on iOS devices?

It seems to connect the websocket, register successfully with the SIP server, but when UA.call is invoked, it doesn't seem to ever send the SIP INVITE.

Probably some audio handling issue (which is quite a bit more complex and restricted on iOS than even on macOS browsers).

[pjkundert]

Some intriguing possible causes are found here by @Qvadis some years ago:

#616

[pjkundert]

OK, so part one of the issue was this:

iOS will refuse to allow Javascript code to access navigator. In RTCSession.js, when we call

return navigator.mediaDevices.getUserMedia(mediaConstraints)

the navigator.mediaDevices is undefined -- unless you're accessing the code in a "secure context": via https://... or file:///

This is not checked, causing an exception -- except since the exception is not thrown by the call itself, but by the code, it trickles down to the final .catch((error) =>, which neither logs nor re-throws the Error, it just swallows it.

I'll submit an Issue and a Pull for this, of course, but there are a couple of other things, too...

[ibc]

except since the exception is not thrown by the call itself, but by the code, it trickles down to the final .catch((error) =>, which neither logs nor re-throws the Error, it just swallows it.

What does "by the code" mean?

[AravindBollabathini]

Has anyone investigated where JsSIP fails, on iOS devices?

It seems to connect the websocket, register successfully with the SIP server, but when UA.call is invoked, it doesn't seem to ever send the SIP INVITE.

Probably some audio handling issue (which is quite a bit more complex and restricted on iOS than even on macOS browsers).

May be there will be an error as Bad Media Description as some of the streams that we are trying to get may not support in Mac.
Recently I got this issue and fixed in my code by changing the methods of retrieving the local and remote streams.

[wnke]

Is this issue related to #604 ? Is particular this comment:

JSSIP does not work on mobile devices iOS. Safari or Chrome or another browser it does not matter, because all browsers on Apple mobile devices use same Webkit.

Is there any possible work around here?