ISDN Fallback for VoIP Media

System feature Network Feature	Description
Definition	The ability to route media for VoIP calls, within one PBX, via the public ISDN, as an alternative to RTP via TCP/IP connection. It can also be used as fallback when encountering Call Admission Control congestion for the IP connection between media gateways and Servers in the same PBX system.
Settings	Inter gateway routing for VoIP media via public ISDN is configured by the administrator. Appropriate ISDN routes must exist.
Procedure and function	The system uses TCP/IP connections between the different Servers (LIMs), but if public ISDN is available, and the inter gateway routing feature is configured, it is possible to route the media connections via ISDN instead of via TCP/IP. Dedicated virtual routes are defined and used for the feature. The ISDN signaling must support either UUI (proprietary data) or transparent calling and called party numbers, in the SETUP message.

System feature Network Feature

Description

Definition

The ability to route media for VoIP calls, within one PBX, via the public ISDN, as an alternative to RTP via TCP/IP connection. It can also be used as fallback when encountering Call Admission Control congestion for the IP connection between media gateways and Servers in the same PBX system.

Settings

Inter gateway routing for VoIP media via public ISDN is configured by the administrator. Appropriate ISDN routes must exist.

Procedure and function

The system uses TCP/IP connections between the different Servers (LIMs), but if public ISDN is available, and the inter gateway routing feature is configured, it is possible to route the media connections via ISDN instead of via TCP/IP.

Dedicated virtual routes are defined and used for the feature.

The ISDN signaling must support either UUI (proprietary data) or transparent calling and called party numbers, in the SETUP message.

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