3Com VCX V7122 User Manual page 57

Figure 22 Internal DNS Table Screen
2
In the 'DNS Name' field, enter the hostname to be translated. You can enter a string up
to 31 characters long.
3
In the 'First IP Address' field, enter the first IP address that the hostname is translated to.
4 In the 'Second IP Address' field, enter the second IP address that the hostname is
translated to.
5
Repeat steps 2 to 4, for each Internal DNS Table entry.
6 Click the Submit button to save your changes.
7
To save the changes so they are available after a power fail, see
page 88.
Reasons for Alternative Routing
The Reasons for Alternative Routing screen includes two tables (Tel IP and IP Tel). Each
table enables you to define up to 4 different release reasons. If a call is released as a result
of one of these reasons, the gateway tries to find an alternative route to that call. The release
reason for IP Tel calls is provided in Q.931 notation. The release reason for Tel IP calls is
provided in SIP 4xx, 5xx and 6xx response codes. For Tel IP calls an alternative IP
address, for IP Tel calls an alternative trunk group.
See the 'Tel to IP Routing
address. See the 'IP to Trunk Group Routing
an alternative trunk group.
You can use this table for example:
For Tel IP calls, when there is no response to an Invite message (after Invite
retransmissions), and the gateway then issues an internal 408 'No Response' implicit release
reason.
For IP Tel calls, when the destination is busy, and release reason #17 is issued or for other
call releases that issue the default release reason (#3), see 'DefaultReleaseCause' in
Table 26 on page 103.
Note: The reasons for alternative routing option for Tel IP calls only applies when Proxy
isn't used.
To configure the reasons for alternative routing, follow these steps:
1
Open the 'Reasons for Alternative Routing' screen (Protocol Management menu >
Routing Tables submenu > Reasons for Alternative Routing option); the 'Reasons for
Alternative Routing' screen is displayed.
3Com VCX V7122 SIP VoIP Gateway User Manual
Table' on page 52 for information on defining an alternative IP
Table'
Save Configuration
on page 54 for information on defining
on
57