VoIP-EPABX integration using FXS
Normally, EPABX are integrated with routers using E&M or E1. These ports can be costly. For a low-priced solution, use the FXS port and join with the trunk port of EPABX.
If there are multiple FXS ports you can create a hunt group. Give the same EXTN number on the public telephone network interface and then define the preference so that a hunt group is formed.
dial peer 100 pots
destination pattern 222
voice-port 0/0
preference 3
dial peer 200 pots
destination pattern 222
voice-port 0/1
preference 4
This was first published in April 2002
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