Hello everyone

 I am trying to connect to a Xlite softphone (running on a Windows 7 professional machine) from a Firefox browser (version 63.0.2 32 bit) running on a Windows 10 professional server

 I am using JSSip as the User Agent Client

The MManage RTC Gateway Compact Version: 8.8 is installed on the machine on which the Firefox browser is running

When I try to connect to the Xlite soft phone the soft phone rings but gets disconnected as soon as I accept the call

The Xlite soft phones logs contains the following error message
SDP: Incompatible media format: no common codec

But the Opus codec is available but for some reason the Xlite Soft phone does not accept the codec

Now coming to my question

In the SDP offer made by Firefox the following entry is there
m=audio 53048 UDP/TLS/RTP/SAVPF 109 9 0 8 101

If I initiate a call the SDP offer from the Xlite soft phone contains the line
m=audio 53048 RTP/AVP 109

 which differs from the SDP offer made by Firefox


My question is why is not the Mizu Gateway changing the SDP in the offer made by Firefox so that it is acceptable to the
Xlite softphone. I tried giving the option to change the SDP in the user settings page. But that does not seem to have any effect

I can connect to a Linphone (softphone) without any problem


Thanks in advance for any tios
Regards
Mathew