ATL Telecom IP300S - Manual (Page 86)

IP SIP Phone v2 User’s Guide Mar. 2005
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z UDP Traversal: Full Access (Public Host IP)
13.2. LAN Configuration to Traverse NAT and
Firewall
There are basically two options for CPE to traverse NAT and Firewall:
z Option 1: Set up a static route in the NAT gateway (Recommend)。
z Option 2: Use STUN to measure out ports.
Please adopt suitable option based on your network configuration.
Note: some SIP ISPs may provide SIP-aware routers (NAT/Firewall) for their customers.
When you use a SIP-aware router, NAT detection should be set to "Off" as if you were on the
public internet and the configuration is the same as “Public Internet Configuration”: set 『UDP
Traversal』 to be 『Full Access (Public Host IP)』, which is to say that you do not have to worry
about the NAT, nor firewall.
13.2.1. Static NAT Route
If you have access to your NAT/Firewall, you may contact your network administrator to
configure your NAT/Firewall route.
z Contact your network administrator and acquire consecutive UDP ports (at least 5
UDP ports in case of IP SIP Phone) mapped from the NAT to your terminal. For
example:
„ NAT IP = 218.81.107.51 (you may detect your NAT IP by clicking 『Diagnose
NAT』)