We have a combined SIP Proxy, Session Border Controller and Media Proxy that enables us to handle far-end NAT problems experienced by end-users. If your equipment is configured to use our proxy it will re-write and translate the packets to work with our system and handle the NAT issues normally faced. The system has been tested with a number of firewalls and routers, it can handle various types of NAT included symmetric, full-cone and half-cone.
If your device doesnt support outbound proxy addressing you can always utilise the STUN protocol. We operate a STUN server for use by our users at the following address;
This shouldnt be necessary if utilise the outbound proxy.