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VoIP between Norstar and Nortel option 11

Hi, i have some problems in the calls between a Norstar and a Nortel option 11, both are connected to a 2811 via E1 with the IOS is c2800nm-spservicesk9-mz.124-15.T3.bin both routers are using h323. We also have a Callmanager 5.1.2.3000-2 that interact with both PBX.

The problem is that when i make a call from the Norstar to the Nortell or CCM the call listens choppy and sometime the voice goes only one side.

Do you know of some debug that i can apply to see ISDN errors, h323 errors, or QoS errors.

Thanks in advanced

Jose

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