Unity Circuit-Switched (Traditional PBX)

This type of integration with a PBX relies on the installation of a voice board in the Unity server and it is being somewhat superseded by the use of the Intel PBX IP Media Gateway (PIMG).

The method of integration of the voice board can be realized via:

  • Serial interface : In this case, you can configure parameters including phone system manufacturer settings, MWI On/Off codes, serial integration packet settings, COM port settings, voice messaging port configuration settings and so on
  • Analog interface : In this case , you can configure parameters including phone system manufacturer settings, MWI On/Off codes, voice messaging port configuration settings and so on

With Serial integration, there are several cabling configurations. The followings are two common one:

  • An RS-232 cable directly connects the Unity server and the phone system. So link between the messages lines are direct between the Unity and the phone system.
  • An RS-232 cable connects the Unity Server and a PBXLink box and digital lines connect the PBXLink box and the phone system.

When using an PBXLink box, the phone system sends information including the called party extension, calling party extension (if available) and the reason for forwarding to the PBXLink.This communication between the PBXLink and the Unity is performed via Simplified Message Desk Interface (SMDI) packets. Unity activates/deactivates MWIs using analog messaging ports (not the serial which is used).

When using an analog integration, voice messaging lines (analog lines) directly connect the Unity and the phone system and the communication is done this time via DTMF sequences.

SIP Forward to Unity

When a SIP Proxy Server forwards calls to Unity, it includes the following information:

  • The called party extension included in the Diversion Header
  • The reason why the call was forwarded in the Diversion Header
  • The extension of the calling party (internal calls) or SIP URL of the calling party in the FROM header.

Call Manager/SCCP forward to Unity

When a call is forwarded by Call Manager to Unity, the following information are included:

  • The called party’s extension
  • The calling party’s extension or external phone number
  • The reason that the call was forwarded to Unity (Busy, No-Answer, Inconditional)

So with these information, Unity is able to route the call to the correct mailbox.

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