Hello, CentOS 6.x and Asterisk 11.x I have an interesting, to me at least, situation. Using a Polycom
501(also tried with X-Lite). I have set up Asterisk to accept registration from the Polycom and it registers successfully but then withing 30 seconds on the CLI I get the message that the Polycom is unreachable. The phone still shows that it is registered and if I try to place a call from the phone to my Cell, my cell rings once and then stops. I get a packet retransmission error:
WARNING: chan_sip.c:4174 retrans_pkt: Retransmission timeout reached on transmission email@example.com for seqno 2 (Critical Response)
n_sip.c:4203 retrans_pkt: Hanging up call firstname.lastname@example.org – no reply to our critical packet I am “assuming” that there is a problem with NAT. I have externip set in sip.conf. Any pointers to what I am missing?