We are trying to integrate a 2620 as an H.323 gateway for a PRI with a Nortel PBX. Running debug shows that we are sending SABME requests, and the PBX vendor says they are seeing those request. Problem is that the PBX sets its D-channel to an active state, but we never receive an ACK on the router so the PRI just hangs on the 2620 with the D-channel in a reserved state. PBX vendor is claiming everything is configured correctly on their end. We have tried setting up for DMS-100, DMS-250, NI on both ends in order to get the D-channel to properly intialize. Has anyone run into this before? Any thoughts on changing over to MGCP instead of trying to run H.323? We have not yet tried to setup as straight T-1 to see what happens, but I don't see what else we can do on our end to fix this.
Assuming it is a Meridian, try using QSIG if the Nortel has the package for it. Otherwise, try 5ESS (ESS5 on the Nortel) and make the 2620 the network side. Nortel doesn't like to be the Network end unless it is running SL1, QSIG, or NI2 (which then requires CBCT setup) See if that helps.
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...