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Avaya have officialy confirmed that SIP fallback to ISDN/PSTN is NOT currently supported. I will have to hope it is a priority for future updates.

On another note. SCN VoIP fall back to PSTN/ISDN is officially supported and in my tests does work well.

Strange isn't it. It seems to be a pretty basic (and very important) feature that is available on a large number of "low end" consumer devices but not a "high end" Avaya IP Office. But unfortunately puregold I think you are right.

I'm having a problem with my own site and clients that have SIP trunks setup. Any time there is a problem with the internet or the ITSP the Avaya does not appear to failover to the Main lines (ISDN in this case) as specified in the Alternate Route of my VoIP ARS table. When looking in System...

I too have had a similar problem with an IP Phone. For the moment I have routed this extensions calls through the main line but I would be interested to know if anyone has any advice. I believe this system has enough VCM channels available as well when I have tested.

My experience with it so far is that (for me) it does not work. In my scenario I have setup an SOE with a SIP trunk to failover (alternate route) back to the Main ISDN. The problem is that it appears the Avaya unit cannot detect when the SIP line is down. After unplugging the cable for my...