I was wondering in regards to SIP transactions, if the new CUCM v11 is drastically different than previous versions?
The reason I am asking is my company is about to start an IVT for a new Endpoint phone with Cisco,
However the most recent they let you test against is V10.5.
If we were to test against V10.5, we need to be sure that there are no major SIP changes which could disrupt interoperability with the new V11.
Does anyone have any ideas if V11 if somewhat backwards compatible?