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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?

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...