In my system a chan_sip warning comes up regularly:
WARNING: chan_sip.c:4120 retrans_pkt: Timeout on fff451ba69f31c38983f7bf25b200555 on non-critical invite transaction.
I see this being a common question but I am asking again as I could not find a guidance to fix my case and any advise is highly appreciated.
First: is this a problem to be concerned about ?
Apparently the system is working … I can make and receive calls
My phones and freepbx server are all on 192.168.0.x behind a router with fixed public address
On the router:
- SIP ALG is disabled
- Ports UDP 5060 and 10000-20000 forwarded to Freepbx box IP
On the Chan-SIP settings
- Public IP inserted correctly
- LAN inserted as 192.168.0.0/24
- NAT = Yes
I have tried to put every possible combinations of NAT and Reinvite settings, including disabling the Freepbx firewall but apparently nothing has changed.
I am running latest FreePBX and Asterisk 13
Where else could I look to troubleshoot this ?