can reproduce at will but this occurred earlier today and I thought someone might be interested.
I was calling the other party and they were texting me approximately at the same time.
I am Bob and my Peer is Alice.
This is the sip simple message I received from Alice.
Alice :
didn't ringSIP/2.0 100 Trying
Via: SIP/2.0/TCP a.b.c.d:5080;rport;branch=z9hG4bK1UUQgUrX15D3m
From: "Bob" <sip:address@hidden>;tag=t8DDmrX22N1cm
To: <sip:address@hidden:16945;transport=tcp>
Call-ID: 93fadc10-d053-1234-70a5-20cf3023bb73
CSeq: 94570348 INVITE
Content-Length: 0