
V6100 and V7122 User Guide
95
No ping to the initial destination is available, or when poor Quality of Service (QoS)
(delay or packet loss, calculated according to previous calls) is detected, or when a
DNS host name is not resolved. For detailed information on Alternative Routing, see
Fax & Modem Transport Modes
.
When a release reason that is defined in the ‘Reasons for Alternative Tel to IP
Routing’ table is received. For detailed information on the ‘Reasons for Alternative
Routing Tables’, see
Reasons for Alternative Routing
.
Alternative routing (using this table) is commonly implemented when there is no response to
an INVITE message (after INVITE retransmissions). The gateway then issues an internal
408 ‘No Response’ implicit release reason. If this reason is included in the ‘Reasons for
Alternative Routing’ table, the gateway immediately initiates a call to the redundant
destination using the next matched entry in the ‘Tel to IP Routing’ table. Note that if a domain
name in this table is resolved to two IP addresses, the timeout for INVITE retransmissions
can be reduced by using the parameter ‘Number of RTX Before Hotswap’.
If the alternative routing destination is the gateway itself, the call can be configured
to be routed back to PSTN. This feature is referred to as ‘PSTN Fallback’, meaning
that if sufficient voice quality is not available over the IP network, the call is routed
through legacy telephony system (PSTN).
Tel to IP routing can be performed either before or after applying the number
manipulation rules. To control when number manipulation is done, set the
RouteModeTel2IP parameter. For information on this parameter, see
Table 51.
To configure the Tel to IP Routing table:
1
Open the ‘Tel to IP Routing’ screen (
Protocol Management
menu >
Routing Tables
submenu >
Tel to IP Routing
option); the ‘Tel to IP Routing’ screen is displayed (shown
in
Figure 37
).
2
In the ‘Tel to IP Routing Mode’ field, select the Tel to IP routing mode (see
Table 51
).
3
In the ‘Routing Index' drop-down list, select the range of entries that you want to edit.
4
Configure the Tel to IP Routing table according to
Table 31
.
5
Click the
Submit
button to save your changes.
6
To save the changes so they are available after a power fail, see
Save Configuration
.
Summary of Contents for V6100
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