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INTEGRATED SERVICES DIGITAL NETWORK

SERVICES OFFERED BY ISDN

The following services are offered on a dial-up basis between any two ISDN subscribers:

Photo-Telephone-Calling

where called party can see each other's pictures on screen.

Desk Top Video Conferencing on dial-up basis using a single ISDN line at 128 Kbps. High Quality Video Conferencing on dial-up basis between any two ISDN subscribers by using three ISDN lines at 384 Kbps.

Teleconferencing

which facilitates the transmission of pictures, documents and drawings etc., apart from voice & video images of the participants, white board sharing & document sharing is also possible.

High speed data transmission at 128 Kbps.

Very high quality in digital mode on account of very high immunity from the noise.

High speed facsimile.

Time taken to send FAX messages reduced to 1/4th.

All other services which a conventional old telephone line provides.

Subscriber can see his metering pulses at his premises.

ISDN supports all Phone-Plus services

available to conventional old telephone line. In addition the following additional facilities are available.

Additional Facilities

• Calling Line Identification Presentation(CLIP)
• Calling Line Identification Restriction(CLIR)
• Closed User Group (CUG)
• Multiple Subscriber Number(MSN)
• Terminal Portability (TP)

Calling Line Identification Presentation(CLIP)

When an ISDN subscriber receives a call, the calling subscriber number will be displayed on his ISDN telephone revealing identity of the caller giving option to the called party to accept the call or not during conversation . It is possible to hold two more incoming calls and ISDN subscriber can switch between the incoming calls.

Calling Line Identification Restriction (CLIR)

By means of this service, the calling subscriber will be able to prevent the presentation of his number to the called subscriber (Prevention of CLIP).

Multiple Subscriber Number (MSN)

Upto 8 terminals can be connected in parallel at the subscriber premises. To call a specific terminal separate numbers can be allotted to each terminal to facilitate when call is received from a normal (Analog) subscriber. Incase the call is received from an ISDN subscriber ,the terminal Selection will be made automatically.

Terminal Portability (TP)

At the subscriber's premises 8 terminals can be connected to a single ISDN line in the sockets provided on internal wiring. The terminals can be in different rooms on different floors. During conversion it is possible to transfer the call from one terminal to another or even remove the terminal and connect it to another socket . This facility is available for calling as well as called subscriber.

Closed User Group (CUG)

Companies and individuals with offices in different cities can have their ISDN numbers function in a closed user group i.e. like a private network, both for voice and data . This group enjoys certain calling privileges like select call- barring and addition level of security.