Quintum Technologies Tenor Call Relay 60 - Manual (Page 12)

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Chapter 1: Overview
NATAccess ™ /Remote NAT support
NATAccess™ is an intelligent network address translation technology. It enables H.323-based and/
or SIP based VoIP networks to operate behind firewalls equipped with Network Access Translation
(NAT); this provides maximum network security. NATAccess simplifies deployment and installation
by eliminating the need to place the Call Relay 60 on a public IP network. Using NATAccess pro-
vides an easy, secure expansion between multiple VoIP sites.
Figure 1-3
IP Network IP Network
Router Router
Deploying the Quintum Tenor with NATAccess on the “Private” LAN
Firewall/NAT Firewall/NAT
“Public” LAN
“Private” LAN
“DMZ” LAN
“Private” Port
“DMZ” Port
NATAccess
The Remote NAT feature enables Tenors with SIP applications to be used in an environment where
endpoints are behind NAT firewalls. As long as a Call Relay 60 is placed in the public IP domain, it
can communicate transparently with any VoIP endpoint (even from other vendors) that is located
behind a NAT firewall. In the case of a NAT firewall application, the actual IP address and port
number that the call comes from is the public (WAN) IP address of the NAT/firewall/router.
Figure 1-4
Call Relay 60
T/A
SIP Phone
NAT/Router
IP Network IP Network
Tenor PC SIP Client NAT/Router
NAT/Router
NAT/Router
Phone
Call Relay 60
Call Relay 60
Remote NAT