Forum Discussion
MS Teams Direct Routing - Internal call transfer failure
Hi all, My organisation is planning a move to direct routing. We have an AudioCodes VE SBC. I've been working on this for awhile and got everything to a pretty decent state. I've come across ...
obviously we dont use same vendor SBC but standard wise logic should remain the same
Thanks for detailed description, I will try to reproduce this behaviour on my SBC, but it looks really strange to me that MS sends a SIP REFER packet back to SBC that connects calls to PSTN and uses LineURI telephone numbers for that. According to RFC it should provide a proper username or DID in such case. From what I can see now it's much simpler to just disallow REFER method and let Microsoft Teams handle internal call transfers on their side, which is more logical, rather than implementing such call forking. Anyway, your help is much appreciated and SIP INVITE packet is a perfect example on what I should try to achieve. Thanks!