Packet-based call answer

The following steps are typically involved in answering a call:

1. The DEFINITY or MultiVantage system (switch) detects a new call.
2. The switch selects a VoIP port to an Avaya IR system based on the dialed digits and translations.
   • If the connection to the Avaya IR system is an H.323 trunk, the switch selects a free trunk member port based on the value you entered in the Trunk Hunt field on the Trunk Group form for DEFINITY or MultiVantage.
   • If the connection is an H.323 terminal, the port is selected based on the dialed extension.
3. The switch forwards the call to the Avaya IR VoIP subsystem.
4. The VoIP subsystem detects a new call and:
   1. Identifies the correct Avaya IR VoIP subsystem channel to use for the call.
   2. Sends a message to the process that owns the channel, informing the process that a new call has arrived on the channel.
5. The process that owns the channel instructs the VoIP subsystem to answer the call.

   By default, the Application Dispatch (AD) process owns all free channels and starts the other processes required to handle calls.

6. The VoIP subsystem answers the call.

   Once the call is answered, there is a media path between the caller and the Avaya IR system.

7. Acting as a Gateway, the switch sends and receives media to and from the Avaya IR system in packets over the LAN.
8. Standard IR system call processing continues until the call ends.

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