AudioCodes Media 800 MSBR User Manual

Version 6.6 345 Mediant 800 MSBR
User's Manual 26. Routing
26.6 Alternative Routing for IP-to-Tel Calls
The device supports alternative IP-to-Tel call routing, as described in this section.
26.6.1 Alternative Routing to Trunk upon Q.931 Call Release Cause
Code
You can configure the device to do alternative IP-to-Tel call routing based on the received
ISDN Q.931 cause code. If an IP-to-Tel call is rejected or disconnected on the Tel side as a
result of a specific ISDN Q.931 release cause code that is listed in the Reasons for
Alternative Routing table, the device searches for an alternative IP-to-Tel routing rule in the
Inbound IP Routing table and sends it to the alternative Trunk Group. For example, you
can enable 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 also 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 Inbound IP Routing table to the Trunk
Group.

Phone number is not found in the Inbound IP Routing table.
By default, it is set to Cause Code No. 3 (No Route to Destination). This default cause
code can be changed using the 'Default Release Cause' parameter located in the
Advanced Parameters page (Configuration tab > VoIP menu > SIP Definitions >
Advanced Parameters). To enable alternative routing based on Q.931 cause code, you
need to define this cause code in the Reasons for Alternative Routing table.
 To configure alternative Trunk Group routing based on Q.931 cause codes:
1. In the Proxy & Registration page, set the 'Redundant Routing Mode' parameter to
Routing Table so that the device uses the Inbound IP Routing table for alternative
routing.
2. In the Inbound IP Routing table, configure alternative routing rules with the same call
matching characteristics, but with different Trunk Group destinations.
3. Configure up to five Q.931 cause codes that invoke alternative IP-to-Tel routing:
a. Open the Reasons for Alternative Routing page (Configuration tab > VoIP menu
> GW and IP to IP > Routing > Alternative Routing Reasons).
Figure 26-7: IP to Tel Reasons - Reasons for Alternative Routing Page
b. Under the 'IP to Tel Reasons' group, select the desired Q.931 cause codes.
c. Click Submit to apply your changes.

AudioCodes Media 800 MSBR Specifications

General

Brand	AudioCodes
Model	Media 800 MSBR
Category	Network Router
Language	English