How to choose the right voice module.

Unanswered Question
Jun 4th, 2007
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Hi Friends,

I'm new to VoIP and I need to buy a voice module for a Cisco 3640 in order to configure a half PRI E1 (15 channels) it will be connected to an Adtran Express 6541 (I will need a balun), which is right module that I need?


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