Teams Direct routing media bypass mode ICE controlled

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New Contributor

I've a strange scenario when I enabled media bypass on my SBC and thought to check with everyone here first before contacting MS.

 

Outbound calls from Teams to PSTN works with ICE being CONTROLLING from Teams end (FULL ICE) and once the call is established Teams starts nominating the ICE candidates via a re-invite and it's handled correctly and audio is flowing in both directions.

 

Inbound calls from PSTN to Teams is having a strange problem from Teams endpoint as the SBC should be ICE-LITE mode (controlled) and not doing any connectivity checks , just responding to them.

 

and SDP being sent looks perfect like the following

 

 

a=rtcp-mux
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:/MdAvE9GIDAg7H6ydytIrVyKbgrirK614YLxHj/F|2^31
a=ice-lite
a=ice-ufrag:wIoWCV4A
a=ice-pwd:fD9WHcj3cCbNPcxDjU9Cp0AUEt
a=candidate:CeTxOSQoHkYUy9st 1 UDP 2130706431 xxx.xxx.xxx.xxx 30036 typ host

 

 

however Teams endpoints are sending their STUN requests as CONTROLLED !! while it should be CONTROLLING.

ice.png

 

yes audio is flowing fine but am not getting the nomination via the re-invite which of course is wrong

any suggestions ?

 

 

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