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Sims_Krastev's avatar
Sims_Krastev
Copper Contributor
Jul 15, 2019

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 ...
microsoft teams
Lt_Flash's avatar
Lt_Flash
Brass Contributor
Jul 15, 2019

Hi Sim,

We've got exactly the same behaviour when trying to transfer calls that came from PSTN network and got answered by one of our Teams users and when they try to transfer to another Teams user. REFER-TO doesn't contain any LineURI or telephone number to complete the transfer. Did you have any luck fixing this issue? Also, I'm not sure if this was working before or not. But you seem to be correct in regards to Teams treating internal transfer as external one and sending SIP REFER back to SBC without providing any additional details in regards where the call should be actually connected or transferred to. When transferring to external number this works perfectly fine, REFER-TO contains an external number and can be processed by our SBC. BTW, can you tell what SBC are you using? Is it AudioCodes or Ribbon one? Or something not currently certified by Microsoft? Thanks!