Inbound calls dropping after 30 secs

System running rock solid for nine month then 5 days ago inbound calls are dropped after about 30 seconds. Just updated system and all modules and still the same problem. Any ideas ? Thanks

Simple answer is this is a NAT issue. Probably Settings>Asterisk Sip Settings> External IP

Check that first. If that is ok post a call trace with sip debug enabled.

James hi
[2014-04-29 16:59:15] VERBOSE[2399] res_musiconhold.c: – Started music on
hold, class ‘default’, on SIP/soho66-00000031
[2014-04-29 16:59:47] WARNING[1684] chan_sip.c: Retransmission timeout
reached on transmission
[email protected]:5061 for seqno 102
(Critical Response) – See
Packet timed out after 34273ms with no response
[2014-04-29 16:59:47] WARNING[1684] chan_sip.c: Hanging up call
[email protected]:5061 - no reply to our
critical packet (see
[2014-04-29 16:59:47] VERBOSE[2399] res_musiconhold.c: – Stopped music on
hold on SIP/soho66-00000031

Resolved, thanks for help, I discovered that the freepbx was using our back up ADSL connection rather than our main cable and the ADSL is not a fixed IP adddress