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Nortel to Cisco SIP NOT Working

Currently running CCM version 5.1.3.1000-12 We were able to get SIP running from Cisco to Nortel from day one but unable to get the reverse running at all. Is anyone doing this and if yes how have they setup the Nortel server side of the connection. As a side bar we do NOT see any attempts from the Nortel sid of the call while use the Cisco trace tool.

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