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Dial from ISDN
The gateway supports four different ISDN Dial In services:
•
IVR
•
IVR + TCS4
•
DID
•
Hotline
Any of these services can be enabled or disabled, but at least one must be enabled for incoming call routing to
take place.
In order to enable parallel incoming calls, a PRI number range must be defined.
IVR
Interactive Voice Response (IVR), also called extention dial-in, is an automated answering system that directs the
call to the IP endpoint indicated by the caller. The caller uses telephone tones (DTMF) to enter the H.323 Alias or
extention.
IVR is useful if you have limited PRI numbers on your PRI line.
Example:
•
A videoconferencing system calls into the Extention Dial In number with IVR active.
•
The gateway activates the 'Welcome' picture and sound.
•
The videoconferencing system enters the extention (H.323 Alias) followed by the # (pound-sign) to
indicate end of number.
•
The gateway starts to call the IP endpoint and the "Call proceeding" picture and sound are activated.
•
When the call is connected audio and video are transmitted through the gateway.
TANDBERG Gateway
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