Registration failed ... 408 Request timeout; internal

[lt8x7]

For some time now all my registrations with my SIP providoers have failed.
They all return a "408 Request timeout; internal" error.
I have made no changes on the server or firewall. I have upgraded to V9, but still have the error.
I have run the Firewall Checker and it reports all is OK.

Any ideas??????

 

[SY]

408 Request timeout; internal

Means that they are not reachable anymore...
Check your network settings.

 

[lt8x7]

All of the providors are reachable by PING and also directly from a SIP handset.