New voice and video services over the LAN and WAN allow small offices, branches and employees working from home to seamlessly communicate. However, the protocols used to enable these services conflict with two of the most notable network security mechanism: Firewalls and NATs. To overcome the limitations of firewalls and NAT, the Coral Sentinel Pro provides the intelligence to allow an organization to install a Coral IP-based system in any firewall or NAT environment.

Sentinel Pro, Tadiran's unique Session Border Control (SBC) solution, enables connection of remote SIP and MGCP IP phones located behind NAT servers or firewalls in the LAN network. Sentinel Pro acts like multiple virtual IP endpoints that receive calls, redefine the incoming IP sockets, and route them to the Call Agent/Proxy through the relevant signaling port. Sentinel Pro performs NAT transversal, allowing users to move freely even with DHCP.

With Sentinel Pro, personnel at corporate headquarters and remote offices, as well as home users and traveling employees, can all be part of a single seamless telephony over IP network, with no damage to network security.

• Enables incoming traffic to be routed through a firewall, without the need to open up a permanent channel to transmit and receive calls
• Enables IP endpoints that are remotely located behind a NAT server to transverse the server
• Establishes local RTP sessions between remote MGCP IP endpoints located behind the same NAT server, thereby freeing up Sentinel Pro RTP resources