3Com VCX V7122 User Manual page 38

Figure 15 VCX V7122 Quick Setup Screen
To configure basic SIP parameters, follow these steps:
1 If the VCX V7122 is behind a router with NAT (Network Address Translation) enabled,
perform the following procedure. If it isn't, leave the 'NAT IP Address' field undefined.
Determine the "public" IP address assigned to the router (by using, for instance,
router Web management). Enter this public IP address in the 'NAT IP Address' field.
Enable the DMZ (Demilitarized Zone) configuration on the residential router for the
LAN port where the VCX V7122 gateway is connected. This enables unknown
packets to be routed to the DMZ port.
2
Under 'SIP Parameters', enter the VCX V7122 domain name in the field 'Gateway
Name'. If the field is not specified, the VCX V7122 IP address is used instead (default).
3 When working with a Proxy server, set 'Working with Proxy' field to 'Yes' and enter the IP
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.
4 Enter the Proxy name in the field 'Proxy Name'. If Proxy name is used, it replaces the
Proxy IP address in all SIP messages. This means that messages is still sent to the
physical Proxy IP address but the SIP URI contains the Proxy name instead.
5 Configure 'Enable Registration' to 'Yes' or 'No':
'No' = the VCX V7122 does not register to a Proxy server/Registrar (default).
'Yes' = the VCX V7122 registers to a Proxy server/Registrar at power up and every
'Registration Time' seconds. For detailed information on the parameter 'Registration
Time', see Table 26
6 Select the coder (i.e., vocoder) that best suits your VoIP system requirements. The
default coder is: G.7231 30 msec. To program the entire list of coders you want the VCX
V7122 to use, click the button on the left side of the '1st Coder' field; the drop-down lists
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on page 103.
3Com VCX V7122 SIP VoIP Gateway User Manual