Yes, it is complex if the B2BUA does not have a media relay ( in which case providing the SDP (at least the port information) itself).
Am 22.04.2010 16:01, schrieb Stefan Sayer:
or, other possibility, empty reinvite: A b2b B |---INVITE / SDPa-->| | | |---INVITE / SDPa-->| | | | | |<-- OK/SDPb--------| | |--- ACK ---------->| |<-- OK/SDPb--------| | |--- ACK ---------->| | | | | ... sst timer expires ... | | | |<--INVITE | | | | | |--- OK/SDPc------->| | now what? ignore that, or do
| |---INVITE / SDPc-->| | |<-- OK/SDPd--------|
This is the proper approach.
one more ping-pong?
No.
|<----ACK/SDPd------|----ACK----------->|
No more ping-pongs needed.
regards klaus