Currently viewing the tag: "fw-1"

Checkpoint Firewall-1 and The SIP Protocol

By On December 30, 2008 · 6 Comments

You have an asterisk based VoIP phone system sitting on an internal network and you are trying to establish connectivity to a SIP-based trunk provider.

You configure a static NAT entry 1-to-1 for the asterisk box and allow the SIP (udp 5060) through the firewall, but SIP registration fails constantly.

While troubleshooting the [...]

Continue Reading →