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AT&T IP Flexible Reach

Nortel BCM450 Release 1.0 SIP Configuration Guide

*Nortel, Nortel Networks, Nortel (Logo), the Globemark, CS1000 are trademarks of Nortel Networks.

Issue 0.4 Page 19 of 33

4.3.1 Failover to Secondary AT&T IP Border Element (IPBE)

Backup to a secondary AT&T IP Border Elements is supported on the BCM450

using the SIP “OPTIONS” keep-alive approach. The BCM450 will send SIP

“OPTIONS” messages to the AT&T IPBEs listed in the Outbound Proxy Table and

send VoIP calls based on whether or not the BCM450 receives a SIP response

from the IPBEs and the Load-balancing Weight values set for each entry.

Figure 12: Outbound Proxy Table for failover to secondary AT&T IPBEs

A Load-balancing weight value of 0 means the IPBE is used as last resort. Any

non-zero number value indicates the ratio of calls (the specific IPBE’s load-

balancing weight to sum of all IPBE’s load-balancing weights) the BCM450 will

send out to each IPBE. In this example, the BCM450 will send 1 call for every 1

call made (in essence, all calls) to the IPBE with IP address 135.25.29.135 and

use 135.25.29.79 IPBE as backup.

Additionally, the AT&T IP Flexible Reach service will send incoming calls to the

BCM450 from multiple IP Border Elements. The BCM450 will accept calls from

any Border Element without additional configuration.

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Avaya BCM450 Guía de configuración Pagina 19