Substations calling external telephone(s)
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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.
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:
Start the string with a "I", followed by the prefix number "0". Then "P", followed by the phone number.
Alternative 2:
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 collection is done in the AlphaCom. The destination phone number is included in the INVITE message from the AlphaCom. The directory 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 wait for more digits. When the number of digits specified in the “Parameter 2" is collected, an INVITE message is sent to the SIP device. If fewer digits are entered, the AlphaCom will send the INVITE after a 3 seconds time out.