We've got a 5 site install using SPnet on a VPN.
It had been working fine.

Customer is changing firewall equipment to Sonicwall
Now we have a situation where some sites can call some other sites but not all sites.
This is internal to internal.

We've complained that it was working till they put the new Sonicall in.
That the issue is their problem.

This is what I got back from their local IT guy:

" I spoke to sonicwall again,
According to sonicwall the vpn connection goes through fine, but then the phone or pbx device closes the connection (sending a “FIN” ) to close the connection."

Does anyone have a clue as to what's going on ?
Kinda desperate.

Thanks