Substations calling external telephone(s)

This article describes how substations in the AlphaCom can be configured to call external telephone number(s).

• If all lines in the SIP gateway are busy, the call will be queued. When the line becomes free, the call will automatically progress.
• Multiple phone numbers can be defined. If the first phone doesn't answer within a preset time, the call can be routed to a second (and a third...) phone number.

One Stage (Enbloc) dialing must be used to achive the described functionality

Configure the Call Button of the substation

The call button can be configured in two different ways to dial a preconfigured phone number.

Let's assume that the prefix to the external phone line is "0", and the phone number to call is 987654321.

Alternative 1:

Call Button configuration

Start the string with a "I", followed by the prefix number "0". Then "P", followed by the phone number.

Alternative 2:

Call Button configuration

Start the string with a "T", followed by the prefix number "0". Then "w" or "W", followed by the phone number. "w" introduces a 0.5 second pause, while "W" introduces a 1.0 second pause. See Play DAK Feature for further details.

Configure the Prefix Number

One Stage dialing (also called "enbloc dialing") must be used. The digit are collected in the AlphaCom and sent to the SIP gateway in INVITE message. The prefix number must be programmed in the AlphaCom directory table with Feature 81 and Node = SIP Trunk node number. In the "Parameter 2" field you must enter the maximum number of digits in a phone number.

When the prefix is dialed, the AlphaCom will collect the number of digits specified in the “Parameter 2" is collected. If fewer digits are entered, the AlphaCom will send the INVITE after a predefined timeout.

Prefix number is 0, SIP trunk node is 100, collect 6 digits, enbloc dialing