User's Manual
518
Document #: LTRT-10375
Mediant 500 MSBR
2.
In the IP-to-Tel Routing table (see Configuring IP-to-Tel Routing Rules on page 504),
configure an IP-to-Tel routing rule to route calls received from the device (i.e., its IP
address) to a specific Trunk Group connected to the PSTN. This configuration is
necessary as the re-routed call is now considered an IP-to-Tel call.
Note:
The PSTN Fallback feature is applicable only to digital interfaces.
27.5 Alternative Routing for IP-to-Tel Calls
The device supports alternative IP-to-Tel call routing, as described in this section.
27.5.1 Alternative Routing to Trunk upon Q.931 Call Release Cause
Code
You can configure up to 10 ISDN Q.931 release cause codes, which if received from the
Tel side, the device routes the IP-to-Tel call to an alternative Trunk Group, if configured.
Alternative IP-to-Tel routing rules are configured in the IP-to-Tel Routing table. These rules
must be configured anywhere below the "main" routing rule and with identical matching
characteristics (e.g., destination prefix number) to the "main" routing rule. The device uses
the first alternative route that is available. For more information on configuring alternative
IP-to-Tel routing rules in the IP-to-Tel Routing table, see Configuring IP-to-Tel Routing
Rules on page 504.
A release cause code indicates that the IP-to-Tel call has been rejected or disconnected on
the Tel side. The release cause codes are configured in the Reasons for IP-to-Tel
Alternative Routing table. For example, you can configure alternative IP-to-Tel routing for
scenarios where the initial Tel destination is busy and a Q.931 Cause Code No. 17 is
received (or for other call releases that issue the default Cause Code No. 3).
You can configure a default release cause code that the device issues itself upon the
following scenarios:
The device initiates a call release whose cause is unknown.
No free channels (i.e., busy) in the Trunk Group.
No appropriate routing rule located in the IP-to-Tel Routing table.
Phone number is not located in the IP-to-Tel Routing table.
The default release code is Cause Code No. 3 (No Route to Destination). You can change
the default code as follows:
To change the default Q.931 release code:
1.
Open the Gateway Advanced Settings page (
Setup
menu >
Signaling & Media
tab >
Gateway
folder >
Gateway Advanced Settings
).
2.
In the 'Default Release Cause' field, enter the release cause code:
Figure
27-11: Configuring Default Q.931 Release Cause Code
3.
Click
Apply
.
Summary of Contents for Mediant 500 MSBR
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