can not hear caller (outgoing call, Fritz!Box SIP server)
I connected Linphone to a Fritz!Box 7580 which provides a SIP server. I can receive incoming phone calls with the Linphone software without any issue.
The problem is with outgoing calls: The callee can hear me ok but no sound is transmitted to Linphone (also the sound icon at the lower left does not show any "activity"). The Fritz!Box event log shows an "unsupported media type" whenever I do an outgoing call so I assume the codec negotiation somehow fails.
I used the Linux Flatpak on Fedora 30 as well as the current Windows version of Linphone.
To resolve the issue I already tried to disable all codecs in Linphone but one but this did not help.
Now I am aware that you probably can not fix the issue given this high-level description and I'm ready to provide network traces and other debug logs on your request.
Also I assume "linphone-desktop" is the wrong gitlab project and the issue is more about the underlying media framework but probably you know better where this bug belongs and I think you can move issues between gitlab projects very easily.
Why should you care about the Fritz!Box SIP server?
- The "Fritz!Box" router series is extremely popular in Germany. They are usually considered the "best in class" for the SOHO market with long support cycles (usually the vendors provides regular firmware updates for more than 5 years).
- I'm a Linux software developer and I'm confident I can provide you with the necessary logs to pinpoint the issue. I can also write low-level scripts which might make it easier to try development versions and patches without building the full stack.