How do you configure VoIP using a 2621XM with a VIC2-2BRI-NT/TE card connecting to a PBX over a basic rate trunk line?
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I believe you want to connect this as follows:
PBX - BRI - Cisco 2621XM - VoIP
The router configuration depends on what VoIP protocol you want to use. There are some good examples here. See the section entitled Router A: Connection to a PBX. If you want to use SIP, an example is given here. See the section called SIP Configuration Examples and note the configuration of the dial peer.
This was first published in August 2004