have recently setup direct routing on CUBE with Teams following the integration guide below
https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise/interoperability-portal/direct-routing-with-cube.pdf
I noticed if a Teams client attempts to perform an internal transfer to another teams client it instead sends the REFER back out to CUBE as it were transferring externally out to PSTN. It ideally should stay within the Teams phone system as transfer was internal to another Teams user. If I disable the SIP refer and use standard INVITE then internal transfer works as normal without the request (INVITE) ever getting to CUBE. Only where it's an external transfer out to PSTN it sends the INVITE back to CUBE
Is there anything in the configuration (that +AAA@ I suspect) which sort of binds any refer messages to always be sent out CUBE's way ? I would like to use refer ideally as it's efficient compared to separate channel consumed by the INVITE. But doing so obviously causes the above issue.
Appreciate any feedback. let me know if require to post SIP ladder/CCSIP trace. thanks.
