Sunny Day: Centralized phone to PSTN number with Music on Hold

Last Updated : Oct 26, 2015 |
Prolog information
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The following image shows the call media flow for a call from a centralized phone to the local PSTN trunk in the branch. In this scenario, the call is put on hold with Music on Hold and then the call on hold is retrieved.
The call on hold uses resources from the central gateway for Avaya Aura® Communication Manager and local trunks in IP Office.
Figure: Call signaling flow for centralized phone to PSTN number with Music on Hold
Call signaling flow description for Centralized phone to PSTN number with Music on Hold in a Sunny Day mode
Call scenario
Description of call signaling flow
User A makes a call to user B. The call connects successfully and user A puts the call on hold. Music on Hold plays in the background while the call is on hold. User A then retrieves the call on hold.
  1. Centralized Phone A calls the PSTN number, and sends an INVITE message to Avaya Aura® Session Manager .
  2. Session Manager sends an INVITE message with the PSTN number to Communication Manager for origination processing.
  3. Communication Manager identifies the call as a PSTN number and uses the ARS table to route the PSTN number back to Session Manager.
  4. Session Manager routes call to the destination SIP Entity that is IP Office, and thenIP Office routes the call to the PSTN number.
  5. After the call is established, RTP media stream is sent directly between Phone A and the PSTN number that is the IP Office number.
  6. Phone A invokes Music on Hold by sending an INVITE toSession Manager with the PSTN number in the To header
  7. Session Manager sends an INVITE to Communication Manager for the Music on Hold feature
  8. Communication Manager exchanges H.248 messages with the gateway for Communication Manager to connect or reserve the Music on Hold resources.
  9. Communication Manager sends back an INVITE to Session Manager to connect to the central gateway for Communication Manager.
  10. Communication Manager exchanges more H.248 messages with the gateway for Communication Manager.
  11. Session Managersends an INVITE to IP Office to connect to the central gateway of Communication Manager and put the call to PSTN with the Music on Hold feature.
  12. The PSTN number is put on hold taking resources from the central gateway and using local trunks in IP Office.
  13. Phone A sends an INVITE message to Session Manager to retrieve the call on hold.
  14. Session Manager sends an INVITE to Communication Manager to retrieve the call from the call on hold status.
  15. Communication Manager exchanges H.248 messages with the central gateway to disconnect or release the Music on Hold resources.
  16. Communication Manager sends an INVITE message back to Session Manager to disconnect from the central gateway of Communication Manager.
  17. Session Manager sends an INVITE to IP Office to disconnect to the central gateway of Communication Manager.
  18. Communication Manager sends an INVITE message to Session Manager to connect to the centralized phone A.
  19. Session Manager sends an INVITE message to Phone A and the call connects and retrieves from the previous state.
  20. After the call is established, RTP media stream is set directly between Phone A and PSTN number that is in theIP Office trunk.
Related links
Sunny day call flows