| Services Offered by ISDN |
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 Normal Telephone & Fax (G3) |
| Digital Telephone - with a facility to identify the calling subscriber number and other facilities. |
| G4 Fax |
| Data Transmission at 64 Kbps with ISDN controller card |
| Video Conferencing at 128 Kbps |
| Video Conferencing at 384 Kbps (Possible with 3 ISDN lines) |
| ATM (Asynchronous Transfer Mode) or PVC (Permanent Virtual Circuit) |
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| List of ISDN stations of BSNL in India |
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| Variety of supplementary Services supported by ISDN. |
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| | | Calling Line Identification Presentation(CLIP) | | | | Calling Line Identification Restriction(CLIR) | | | | Multiple Subscriber Number(MSN) | | | | Terminal Portability(TP) | | | | Call Hold(CH) | | | | Call Waiting(CW) | | | | User to User Signaling (UUSI) | |
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| Types of Accesses. |
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| There are two types of "accesses" connections for ISDN | | | | Basic Rate Access(BRA): 2B+D | | | | 2 Channels of 64 Kbps for Speech And Data. | | | | 1 Channel of 16 Kbps for Signalling | | | | Primary Rate Access (PRA): 30 B+D | | | | 30 Channels of 64 Kbps for speech and data. | | | | 1 Channel of 64 Kbps for signalling. | |
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