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Last Updated on 21st August 2020

ISDN Services
Put your business on a fast track with MTNL ISDN

ISDN is a state-of-the-art digital network service that provides high-quality voice, data and image transfer and also inter-computer file transfer simultaneously on the existing pair of phone lines of the subscriber, at high speed. This service is provided using existing copper cable networks in over 300 cities in India and 28 countries world over.

So give an edge to your organization with MTNL ISDN.


ISDN Applications

Photo Telephone Calling - where the called party can see each other's pictures on the screen.

Desk Top Video Conferencing - on a dial-up basis using a single ISDN line at 128 Kbps.

High-Quality Video Conferencing  - on a 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, whiteboard 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 - To send FAX messages the time taken is reduced to 1/4th compared to a conventional old telephone line provides. A subscriber can see his metering pulses at his premises.

ISDN supports all Phone-Plus services - available to a conventional old telephone line. In addition, the following additional facilities are available.

Calling Line Identification Presentation(CLIP) - When an ISDN subscriber receives a call, the calling subscriber number will be displayed on his ISDN telephone revealing the identity of the caller giving an option to the called party to accept the call or not during the conversation. It is possible to hold two more incoming calls and the 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) - Up to 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 a call is received from a normal (Analog) subscriber. In case the call is received from an ISDN subscriber, the terminal Selection will be made automatically.

(Kindly note, Rs. 30 (i.e. Rs. 2.5/month) per auxiliary MSN Number allotted against ISDN PRI lines will be charged once in a year or per month. Charges applicable w.e.f. 1st April 2013.)

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 the conversation, 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 the 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 an additional level of security.



PlanMonthly Service ChargesFree CallsCall Charges beyond free calls
Basic Plan (Plan-1) Rs 750 60 61-300 Rs. 0.80 Above 300 Rs.1.20
General Plan (Plan-2) Rs 750 Nil  Rs 1.10
Special Plan (plan-3) Rs 1,500 1,200  Rs 1.10
Super Plan (plan-4) Rs 3,300 3,600  Rs 1.10


PlanMonthly Service ChargesFree CallsCall Charges beyond free callsApplicable Discount
(If the billed amount
exceeds plan
charges by 50%)
Applicable Discount
(If the billed amount 
exceeds plan 
charges by 100%)
General Plan *
Rs. 5,000 Nil Rs 0.90 0 2.5%
Plan-A * Rs. 9000 9000 Rs. 0.90 2.5% 5%
Plan-B * Rs. 11,500 11,500 Rs. 0.85 2.5% 5%
Plan-C * Rs. 15,000 15,000 Rs. 0.80 2.5% 5%
Plan-D * Rs. 30,000 30,750 Rs. 0.70 4% 6%
Plan-E * Rs 45,000 50,000 Rs 0.65 5% 7%
Plan-F * Rs 60,000 71,000 Rs 0.60 7% 10%
Plan-G * Rs 75,000 82,000 Rs 0.40 8% 12%
Plan-H * Rs 90,000 1,10,000 Rs 0.30 12% 15%
* Revised plan charges applicable w.e.f. 01/05/2018

Please Note : 

  • Equipment like Telephone Instrument, Broad Band Modems /CPEs  (Customer Premises Equipment), ONU(Optical Network Units), NT1
    (for ISDN lines), if provided at Customers' premises by MTNL, are the sole property of MTNL, Mumbai.
  • Pool Billing:- Arrangement for pool billing of ISDN PRI terminated at one EPABX is permitted.
  • Each PRI carries the traffic of 30 lines.
  • Rs. 30 (i.e. Rs. 2.5/month) per auxiliary MSN Number allotted against ISDN PRI lines will be charged once in a year or per month. Charges applicable w.e.f. 1st April 2013.
  • CIP plans are applicable for those customers paying monthly telephone bills of Rs 1 Lakh or above.
  • Two years of service commitment.
  • For ISPs, only the 'General Plan' is permissible.
  • For new bookings/change of tariff plan, please call the nearest CSC.
  • Missed calls are not charged and metering starts only after called party answers.

Other Charges

Registration Charges
Basic Rate Access Nil
Primary Rate Access Nil
Security Deposits
Network Termination(NT1) Rs. 1,000 (to be collected in the 1st bill) Non-refundable
Simple ISDN Handset Rs. 16,000
ISDN PC Card Rs. 9,600
ISDN Feature Phone Rs. 7,000
Terminal Adapter Rs. 50,000
ISDN PBX (per Port) Rs. 50,000
G4 FAX Terminal Rs. 3,68,000
Video Conferencing System Rs. 76,000
Other Deposits
Initial Deposit for BRA Rs. 5,000
(Rs. 3,000 will be collected at the time of initial booking & Rs. 2,000 to be collected in the first bill)
Initial Deposit for PRA Rs. 15,000 *
Installation Charges
Wiring up to network terminal for PRA Rs. 4,000
Wiring up to network terminal for BRA Rs. 300
Subscriber Interface Bus Rs. 500
ISDN Terminals  
ISDN PC Card Rs. 400
ISDN Feature Phone Rs. 550
Terminal Adapter Rs. 475
ISDN PBX per Port Rs. 800
G4 FAX Terminal Rs. 6,000
Videophone Rs.1,350
Safe Custody charges
For Basic Rate Access (BRA) NIL
For Primary Rate Access (PRA) 20% of the standard rent i.e. Rs. 1000/- per month
Safe Custody period of 1 year & grace period of 3 months.
One time charges of Rs. 100/- will be taken at the time of reconnection.
* Rs.15,000 are also exempted for corporate customers paying revenue of Rs.1,00,000 or more per month for all MTNL services together.

Incentives / Rebates

MTNL has started giving the following Incentives/Rebate to the Customers who purchase & provide their own HDSL Modems at both the ends for ISDN PRA lines.

  • Waiver of Installation Charges of Rs.4000/-
  • A rebate of Rs.1000/- per month will be given in charges of Rs.5000/-OR Assured Charges as per one of the CIP Schemes for one year only.
  • The HDSL Modem will be maintained by the Customer & Modem will remain property of the Customer.


Charges for point to point connectivity: ISDN BRA Lines

Registration Charges Nil
Security Deposit (refundable) Rs.6000/-(will be collected at the time of registration)
Installation Charges Rs.600/-(Rs.100/-if internal wiring is done by the customer)
Monthly Access Charges Rs.2900/-plus Goods & Service Tax(no other calls except point to point calls are allowed)
NT Charges (non-refundable) Rs. 1,000/-
Modems To be provided by the customer.
Installation and Testing charges Same as for normal ISDN BRA line.
No metering on these lines, as these will be strictly from point to point basis.

Temporary ISDN

Charges for Casual / Temporary ISDN connections

Connectivity charges (to be paid in advance)

Connectivity charges Rs.500/per week Rs.5000/- for 15 days
Rs.10000/- for > 15 days to 30 days
Rs.10000/- + proportionate rent for additional no. of days for a period of one month & above.
Security Deposit for NT or Modem Rs.2000/-(NT) Rs.10000/-(If MTNL provides HDSL Modem)
NIL-(If HDSL Modem is arranged by the customer himself)
Security Deposit for
(a)Local calls:
(b)STD calls:
(c)ISD calls:





Installation Charges Rs.150/- per line Rs. 4,000/- (non-refundable)
(to be collected in the 1st bill)
A minimum period of hire One week 15 days
Free Calls NIL NIL
Call charges Rs.1.20/- per unit Rs. 1.00 per unit

Terms and conditions

  • The amount shall be payable in advance for total no. of days for which causal connection is required.
  • The security deposit amount shall be refundable on depositing the HDSL Modem back to MTNL in good working conditions. In the case of Loss/ Physically damaged/ Burnt HDSL Modem, the security deposit amount shall be forfeited by MTNL.
  • Extension of the scheme will be allowed with payment of demand note for additional no. of days at least 3 days prior to the closing of the connection. No Installation charge will be levied in case of an extension of this scheme.
  • Security deposit is not applicable in the case of Government agencies.

For more details, please send E-Mail on;

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