Alcatel Voice over WLAN (R1.1.1) Specifications download pdf (Page 64)

The communication server monitors the links to each media gateway using a polling dialog. An

interruption of this dialog informs the communication server that a failure has occurred. The

communication server then attempts to reach the remote media gateway over the PSTN (via GD

internal modems). During this time, the remote media gateway restarts.

Return to normal

In backup mode, the media gateway periodically polls the IP network.

When the IP network connection is re-established, the media gateway switches the communication

server signaling back to the normal link.

All calls are maintained while normal IP network signaling is re-established.

In addition, when the IP network is unavailable, voice inter-site communications can be established

via the public network. Dialed internal numbers are translated automatically into public numbers.

This mechanism can also be used when the Call Admission Control of the remote site is reached.

Note 2: Because a minimum of telephone services are offered for inter-site communications, it is not

recommended to use this “private to public overflow” permanently.

Within the Alcatel-Lucent OmniPCX Enterprise Communication Server architecture, it is possible to mix both

features, PCS and "Backup Signaling Link of Media Gateways", if they do not back up the same sites.

7.3

Full survivability for remote sites: Passive

communications server

The Passive Communication Server (PCS) provides call handling services to a media gateway or

group of media gateways if the Alcatel-Lucent OmniPCX Enterprise Communication Server is

unavailable.

If the IP links to the site which hosts the Communication servers are broken or the Communication

servers are out of service, call processing continues at a local level.

PCS use in SIP environment:

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Alcatel Voice over WLAN (R1.1.1) Specifications Page 64