Inbound Call Issues

[Jake]

I'm trying to use the SIP Flashphoner as a 3CX Client and it can't answer the external Inbound call from Telco.

Look like the cause comes from the INVITE send to Flashphoner that doesn't have SDP.

But It worked pretty well when I tried to establish a call from the Internal extension with the INVITE include SDP.

 

[Max]

Good day.
Yes, WCS does not support delayed offer, so INVITE must contain SDP to establish a call.

 

[Jake]

Flash Phoner is a SIP WebRTC gateway, can you invite WebRTC leg with an early offer even when you receive SIP leg with Delayed Offer?

 

[Max]

Flash Phoner is a SIP WebRTC gateway, can you invite WebRTC leg with an early offer even when you receive SIP leg with Delayed Offer?

WCS does not support SIP delayed offer in any way. Please configure your PBX to do not use delayed offer.