The Avaya IR system assigns applications to channels. When a call arrives on a DEFINITY or MultiVantage port, it goes to the corresponding Avaya IR channel, and the application assigned to the channel will execute. So, understanding how switch ports map to Avaya IR channels is a prerequisite to knowing which voice response applications will run for different calls.
To make H.323 trunk configuration easier, the VoIP feature reflects the conventions for channel and port configuration as used in switches and circuit-based connections whenever possible. However, there are some important rules and differences to consider when you are configuring H.323 trunks on the Avaya IR system. This section explains those rules and differences.