REFER-TO // Microsoft Team DIrect Routing Implementation

SBC S-CZ9.1.0

Hi guys,

I have some doubts how the SBC should treat the refer received from Teams ... maybe even other SIP Servers.

Does the SBC look on host in REFER-TO header to create the new INVITE and if is a SA will send the new INVITE there? Or should trigger a new policy lookup no mather of host in the refer-to?

Now when i receive from Microsoft Teams a REFER the SBC is sending a new invite to Teams as their refer-to looks like:

refer-to: <sip: number@sip.pstnhub.microsoft.com:5061;user=phone;transport=tls>

So in my case the SBC will send the new invite to Teams either if the number is internally to Teams, either an external nb.