TANDBERG GW User Manual page 20

Dial from ISDN
IVR + TCS-4
IVR + Terminal Control Session 4 (TCS-4) is an extention dial-in method that combines IVR with TCS-4. In this
mode the extention number can be indicated with telephone tones (DTMF) or TCS-4 signaling.
TCS-4 allow an ISDN based videoconferencing endpoint to dial an IP endpoint directly, without having to go
through the same procedure as for IVR. If no TCS-4 extention is given from the endpoint, then IVR will be used.
To use TCS-4, it needs to be supported by the videoconferencing endpoint. Refer to the User Manual of the
videoconferencing endpoint to see how TCS-4 is supported.
Example:
•
A videoconferencing endpoint calls into the Extention Dial In number with IVR + TCS-4 active, using
<Extention Dial In number of gateway><*><party's extention>.
•
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.
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 the H.323 Alias.
In order to use DID you will need to have assigned multiple ISDN numbers to your ISDN PRI line, as each ISDN
number will map to a single IP endpoint.
We also recommend that if more than one PRI line is used all PRI lines should have the same numbers (use trunk
groups).
Example:
•
Your ISDN PRI 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 ISDN Dial In Configuration, set 'No. Significant Digits' to 4 and 'Prefix (E.164)' 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 "Call proceeding" picture and sound are activated.
•
When the call is connected audio and video are transmitted through the gateway.
TANDBERG Gateway
T '*'
HE
NOTE
VENDORS WILL HAVE DIFFERENT METHODS OF ENTERING THE
TCS-4
20
TANDBERG
IS SPECIFIC TO ENDPOINTS
.
EXTENTION
. O
THER