SIP Hold with c=0.0.0.0
Hi,
I have a system A communicating in SIP with a CUCM, the Acme (ver 8.3) residing in the middle:
A <------- Acme -------> Cisco CUCM.
When hold is pressed on the Cisco Phone behind the CUCM, the CUCM sends a re-INVITE with c=0.0.0.0 & a=inactive.
The problem is that A does not support the above c=0.0.0.0 and as a result sends back a 200 OK with no SDP.
Upon receiving the 200 OK, in the absence of SDP, the CUCM drops the call.
Is there a way for the Acme to capture the re-INVITE, block it and answer instead of A (a 200 OK with SDP)?