I’m trying to set up an asterisk server in an Azure VM. I’ve managed to install and can get my local soft phone to register and initially connect for a few seconds with several 200/Ok messages passed. Eventually, I get an error “chan_sip.c:4119 retrans_pkt: Retransmission timeout reached on transmission POiFG2BiNjU3XRX2_MsrOA… for seqno 2 (Critical Response) – See”
I’ve opened all the ports to my IP and disabled all firewalls, which seems to allow for registering and initiating a call but does not allow the call to actually occur. I get an answer but then none of the other steps defined in the extension occur correctly. As far as I can tell, everything on the Azure server and VPN is wide open.
I’ve tried enabling nat=yes and nat=comedia and neither changed the behavior.
I’m using Zoiper on Ubuntu as the softphone and just following the hello-world example. I’ve tried turning STUN on and off (not sure that I’m setting this up correctly), but it has no effect.
Sorry if this is not the correct place to ask this question. I think that everything on the Azure server and VPN are wide open, so I think that I don’t have some sort of NAT setting correct.
I’ve attached the full sip debug log in the pastebin below: