I have Avaya IPO 500v2 R9.1 with 2 analog trunks installed at a site. The issue is that when calling from outside the organization the operator hear 1 ring, then the caller ID displayed after that the call disconnect and the two lines go to busy.
1st try to Isolate the lines from the system and test lines with a test set, then you will know if it's a provider issue or an issue with the IP Office
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