hello guys, I’m with a relay problem, where the customer has 200 branches on an internal network, and retransmits happens all day, retransmission of INVITE, CANCEL and even BYE

one example:
[2015-11-11 09:16:58] DEBUG[21120] chan_sip.c: Trying to put ‘CANCEL sip:’ onto UDP socket destined for
[2015-11-11 09:16:59] VERBOSE[24011] chan_sip.c: Retransmitting #1 (no NAT) to


Not an Asterisk problem.

The peer is responding too slowly, or the network is dropping packets, or the network round trip time is excessive, e.g. due to buffer bloat.

If you are getting maximum transmissions exceeded, rather than occasional ones, you will need to provide SIP traces.