What is the problem with SIP retransmits?
Sometimes you get messages in the console like these:
retrans_pkt: Hanging up call XX77yy - no reply to our critical packet.
retrans_pkt: Cancelling retransmit of OPTIONs
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The SIP protocol is based on requests and replies. Both sides send
requests and wait for replies. Some of these requests are important. In
a TCP/IP network many things can happen with IP packets. Firewalls, NAT
devices, Session Border Controllers and SIP Proxys are in the
signalling path and they will affect the call.
