FAQs >> VoIP

Q. Who can have a VoIP Phone?>
Q. Who can I book a VoIP Phone?
Q. How does VoIP Phone work?
Q. Does MTNL VoIP phone really work like a regular line?
Q. Does simultaneous Internet browsing affect VoIP Phone quality?
Q. What services will run simultaneously?
Q. What is SIP?
Q. What does the Telephone Adapter do?
Q. What does DHCP mean?
Q. How much bandwidth does a voice call use?
Q. Does the bandwidth used while making VoIP calls add to my Broadband Bill?
Q. Do I get another phone number with MTNL VoIP Service?
Q. Is my MTNL VoIP number listed in the telephone directory?
Q. If I cancel my MTNL Broadband service will this automatically end my MTNL Voice service?
Q. Are emergency service calls available with MTNL VoIP Service?
Q. How good is the voice quality?
Q. What kind of phones can I use with the service?
Q. Can I connect my VoIP lines to a telephone switch (or PBX)?



Q. Who can have a VoIP Phone?
Ans. Any MTNL landline subscriber having a Broadband connection can have a MTNL VoIP phone. If broadband is not availed, PSTN customer can apply for the same.

Q. Who can I book a VoIP Phone?
Ans. A VoIP phone can be booked by through MTNL Sanchar Haats or by dialling 26990000 / 22221500.

Q. How does VoIP Phone work?
Ans. With VoIP phone, phone calls are converted to digital data which uses part of the bandwidth that comes with your MTNL Broadband connection.

MTNL VoIP uses 'Voice over Internet Protocol' (VoIP) technology and it's just a great new way to make and receive phone calls using your broadband connection instead of your standard phone line. MTNL converts your phone calls into data that zips through your high-speed broadband connection just like email. It comes out the other end just like a regular phone call. Your callers are unlikely to know that it's any different since it sounds just like a regular phone call.

With MTNL VoIP Service, you can have a additional ‘virtual’ phone line without having to pay for new cabling to your premises.

Q. Does MTNL VoIP phone really work like a regular line?
Ans.You just plug your phone in to the telephone adapter and make your calls as usual (VoIP to International PSTN/Mobile and MTNL VoIP to MTNL VoIP). There is no need to use a headset or install additional software. However you will not be able to receive calls from any normal PSTN/ Mobile phone at present.

Q. Does simultaneous Internet browsing affect VoIP Phone quality?
Ans. The speed of browsing will slightly reduce when VoIP phone is working. Quality of voice through VoIP phone is not affected by Internet Browsing.

Q. What services will run simultaneously?
Ans. The PSTN telephone , Broadband Internet, IPTV & VoIP phone will all work simultaneously on your telephone line.

Q. What is SIP?
Ans. SIP stands for Session Initiation Protocol. SIP or Session Initiation Protocol is an application-level control protocol for
setting up, changing and terminating multimedia sessions between participants on IP data networks.


Q. What does the Telephone Adapter do?
Ans. The Telephone Adapter is an analogue to digital phone converter. It makes it possible to use your MTNL Broadband connection for additional virtual lines.

Q. What does DHCP mean?
Ans. DHCP stands for Dynamic Host Configuration protocol. It refers to the way your computer/ATA obtains an IP address.
If you have DHCP enabled on your ATA, your Telephone Adapter will get an IP address automatically.


Q. How much bandwidth does a voice call use?
Ans. This depends on which codec you choose when you set up the service. MTNL VoIP service is currently offering a very bandwidth efficient voice coder G.729 which will use only 35Kbps bandwidth for a call.

Q.Does the bandwidth used while making VoIP calls add to my Broadband Bill ?
Ans. The MB usage of VoIP service is not charged.

Q. Do I get another phone number with MTNL VoIP Service?
Ans. When you sign up to MTNL VoIP Service you are given a number starting with 011296.
You will also keep your existing landline number.


Q. Is my MTNL VoIP number listed in the telephone directory?
Ans. Your MTNL VoIP is currently not listed in the telephone directory.

Q.If I cancel my MTNL Broadband service will this automatically end my MTNL Voice service?
Ans. Closing your MTNL Broadband Account will automatically cancel your MTNL VoIP service.

Q. Are emergency service calls available with MTNL VoIP Service?
Ans. Access to Emergency Services from VoIP phone is not provided. MTNL has provided a primary telephone line for contacting the emergency services so that they can use your geographic telephone number to locate you quickly and easily.

Q. How good is the voice quality?
Ans. Voice clarity is much better than a mobile phone and it's unlikely either you or your caller will notice the difference to a normal phone line. Variations in Call Quality may occur with varying international bandwidth conditions.

Q. What kind of phones can I use with the service?
Ans. Most standard touchtone phones work with MTNL VoIP Service. However, you cannot use older pulse-dial phones.

Q. Can I connect my VoIP lines to a telephone switch (or PBX)?
Ans. Some PBXs can be configured to support MTNL VoIP lines. However, MTNL VoIP Service is a stand-alone solution and will not work with every type of PBX. We suggest that you contact your PBX manufacturer for further information.