Information Technology Reference
In-Depth Information
Circuit Switched (Traditional PBX)
This type of integration with a PBX relies on the installation of a voice board in the Unity server, and the use of the PBX IP Media
Gateway (PIMG) or T1 IP Media Gateway (TIMG). Note that voice boards are no longer supported in Unity 8.0.
When configuring circuit-switched (traditional PBX) integration using a voice board via UTIM, you can choose various integration
methods, including the following:
■
Serial:
In this case, you can configure parameters such as phone system manufacturer settings, MWI on/off codes, serial
integration packet settings, COM port settings, voice-messaging port configuration settings, and so on.
■
Analog:
In this case, you can configure parameters such as phone system manufacturer settings, MWI on/off codes, voice-
messaging port configuration settings, and so on.
When using a serial integration, there are several cabling configurations. Here are two common ones:
■
An RS-232 cable directly connects the Unity server and the phone system. Voice-messaging lines directly connect the Unity
server and the phone system.
■
An RS-232 cable connects the Unity server and a PBXLink box, and digital lines connect the PBXLink box (or boxes, which
emulate digital phones) and the phone system. Voice-messaging lines are directly connected between the Unity server and the
phone system.
When using a PBXLink box, the phone system sends information including the called party extension, calling party extension (if
available), and reason for forwarding to the PBXLink. The PBXLink communicates this information to the Unity server using
Simplified Message Desk Interface (SMDI) packets. Also, Unity activates/deactivates MWIs using analog messaging ports (not the
serial link, which are used for this in other serial integrations).
When using an analog integration, voice-messaging lines (analog lines) directly connect the Unity server and phone system, and they
communicate using DTMF sequences.
