3Com VCX v7111 Installation Manual page 37

VCX V7111 SIP Quick Setup Screen
Figure 19
To configure basic SIP parameters, follow these steps:
If the VCX V7111 is behind a router with NAT enabled, take the following procedures:
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Determine the "public" IP address assigned to the router (by using, for instance,
router Web management). This "public IP address" is used to configure the VCX
V7111 Static NAT IP address.
Enable the DMZ configuration on the residential router for the LAN port where the
VCX V7111 gateway is connected.
Enter the public IP address for the VCX V7111 in the 'NAT IP Address' field (in
addition to the gateway's local IP address).
Under 'SIP Parameters', enter the VCX V7111 Domain Name in the field 'Gateway
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Name'. If the field is not specified, the VCX V7111 IP address is used instead (default).
When working with a Proxy server, set 'Working with Proxy' field to 'Yes' and enter the IP
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address of the primary Proxy server in the field 'Proxy IP Address'. When no Proxy is
used, the internal routing table is used to route the calls.
Enter the Proxy Name in the field 'Proxy Name'. If Proxy name is used, it replaces the
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Proxy IP address in all SIP messages. This means that messages are still sent to the
physical Proxy IP address but the SIP URI contains the Proxy name instead.
3Com VCX V7111 Fast Track Installation Guide 37