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TANDBERG 3G Gateway User Manual
3.2 Dial from UMTS
The 3G Gateway supports three different UMTS Dial In services:
- “DiD” Æ Direct Inward dialing from a 3G handset.
- “IVR” Æ Dialing terminals from a 3G handset via a selection menu.
- “Phonebook” Æ Selecting an entry from a gateway phone book.
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.
For more details on UMTS Dial-In services, please see the section ‘5.10 Services’.
DID
Direct Inward Dialing (DID) will provide you with direct ISDN numbers for your IP endpoints i.e. it
will do a direct mapping between your ISDN number and an H.323/SIP Alias or vice versa. In
order to use DID you will need to have assigned multiple ISDN numbers to your ISDN PRI or BRI
line, as each ISDN number will map to a single IP endpoint.
Example:
Your ISDN number range is from 67124000 to 67124050 and DID is enabled.
You want your IP endpoints to have the numbers (H.323 Alias) in the range 94000 -
94050.
In the services Configuration, set (remove) Prefix/Nr to 67124, set Service Type to
DiD and (add) Prefix/Nr to 9.
To call an IP endpoint with H.323 Alias 94020 from ISDN, dial the ISDN number
67124020.
The gateway starts to call the IP endpoint and the “connecting” picture and sound are
activated.
When the call is connected audio and video are transmitted through the gateway.
IVR
Interactive Video Response (IVR), also called extension 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/SIP Alias or extension.
IVR is useful if you have limited numbers on your ISDN PRI or BRI line.
Example:
A videoconferencing system calls into the Extension Dial In number with IVR active.
The gateway activates the ‘Welcome’ picture and sound.
The videoconferencing system enters the extension (H.323 Alias) followed by the #
(pound-sign) to indicate end of number.
The gateway starts to call the IP endpoint and the “Connecting” picture and sound are
activated.
When the call is connected audio and video are transmitted through the gateway.
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