ATA phone invoking Communication Manager call pick-up feature call flow

Last Updated : Nov 03, 2015 |
Prolog information
Metadata
Keywords:
In Sunny day, users can invoke the Communication Manager call pick-up feature by dialing a Communication Manager Feature Access Code (FAC) or Feature Name Extension (FNE) on the ATA user’s phone. IP Office does not process the dialed string or identify the Communication Manager feature accessed.
Figure: ATA call media flow with the Communication Manager call pick-up feature
The media flows between the headquarters user A and the ATA user in the branch through IP Office. IP Office connects and interworks the media flow on the IP network side with the TDM media on the connection to the ATA user’s phone. The call signaling and media flow is shown in more detail in the following table.
Call signaling flow description for call pick-up feature with Centralized ATA phones
Call scenario
Description of call signaling flow
  1. Headquarters user A in the data center makes a call to Centralized SIP user (B) in the branch.
  2. ATA user hears the Centralized SIP phone (B) ringing and wants to answer the call on their ATA phone. So the ATA user dials a FAC to invoke the Communication Manager call pick-up feature and answer the call.
  3. Centralized SIP user (B) and the ATA user in the branch are in the same call pick-up group, so Communication Manager delivers the call directly to the ATA user and cancels the call previously delivered to user B.
  1. User A Communication Manager SIP INVITE to Session Manager Centralized SIP user (B)
  2. SIP INVITE carrying FAC sent from IP Office Session Manager Communication Manager
  3. Communication Manager SIP 200 OK message to Session Manager IP Office ATA user
The Communication Manager call pick-up feature is not supported in Rainy day.