Sounds like a firewall setting to me. If you can ping, then Internet
Control Message Protocol (ICMP) packets are allowed, but if SIP traffic is
returning the ICMP Type 3 (code 13) response, then your SIP ports are
blocked (at least the firewall admin was nice enough to leave the reason
code
Hello,
I've got a remote system that is plagued with a strange issue.
It happens from time to time.
Yet, I've not found any condition that trigger this phenomenon.
Here is my setup:
- PSTN <---> ITSP <--SIP trunk--> Router <> Switch <> Asterisk
box
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