When a user makes a call by dialing a number:

1. Dial Short Code Completed:

   The dialing is processed though user, user rights, system and ARS short codes.

2. SIP Line URI/Line Appearance Matching:

   The IP Office looks for a SIP URI with the same Outgoing Group as the short code's Line Group ID.

   1. Each line is checked in Line Number order.

   2. SIP Line Appearance entries are checked first, then SIP URI entries.

   3. Entries that have reached their Max Sessions or Outgoing Sessions are skipped.

   4. Once a match is found, it and the SIP line to which it belongs are used:

      • The line's Call Initiation Timeout (s) (default 4 seconds) sets how long the IP Office waits for a response to the attempt to initiate a call before following any alternate routes set in the ARS form.

      • The line's Call Queuing Timeout (m) (default 5 minutes) sets how long the IP Office waits for the call to be answered after receiving a provisional response.

3. No Available URI:

   If all possible matches have reached their Max Sessions or Outgoing Sessions value:

   • If the call was routed via an ARS short code, the ARS settings determine whether the call can be redirected to an alternate route.

   • Otherwise, the call waits for a matching URI to become available ("Waiting for Line").