ok - I have been lookingf at the UM logs on exchange when a diverted call comes in from the two paths:
If I call a busy extension and it gets diverted using the direct sip trunk to exchange I get a message on the exchange server as follows:
A call was received with the following parameters:
Calling Party: "sip:5956@100.0.1.2",
Called Party: "sip:6159@exchangeserver.my.domain",
Diversion Information: ""<username>" <sip:5965@100.0.1.2>;reason=user-busy;counter=1",
Referred-By Header: "",
Call ID "3868999760-92479639@100.0.1.2".
Notice how the diversion information is set correctly.
If I do the same but via a trunk connecting to Lync the Diversion information is not set. Any ideas how I can rectify this or is this not related?
Thanks,
Sam