What IPO sw/hw do you have? With certain software versions (4 -7) you can have SIP trunking between the systems (providing you have the right licensing and hardware).
Avaya now have the B5800 gateway, which is IP500v2 hardware as a SIP gateway off SM, you may be able to migrate the IPO site to this.
Thankyou both. I am now in a position to spend more time to investigate. The system is in another country and I have not been able to get any body locally to geive me the full information yet.
At least now I know there are some options to progres.
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