ISDN PRI gives you high-capacity, digital access to the Public Switched Telephone Network (PSTN) for an easy and seamless integration of all your voice, data and video communications.
ISDN (Integrated Services Digital Network) PRI (Primary Rate Interface) can support up to 23 simultaneous voice channels and 1-D channel, enabling faster connections and clearer signals as compared to analog lines, plus a sophisticated set of features, high quality and competitive rates.


Save Money, Improve Efficiency

Simplified network management, maintenance and billing yield considerable cost savings for basic operational duties.

Plenty of Capacity with Big Savings

A PRI can handle 23 calls on a single line and can support hundreds or even thousands of people needing to make or receive telephone calls.

Increased Productivity

Feature-rich services, fast speed, crystal clear voice quality and simultaneous multiple transmission capabilities will boost your company’s productivity.

Many Advanced Features Also Available

We offer a full portfolio of powerful call management features to address your needs and goals.

Low Long Distance Calling Rates

Enjoy big savings on all your long distance calls.


  • Direct Inward Dialing (DID) enables outside callers to reach an internal extension without passing through an operator.
  • Vanity Numbers so you can create personalized and reserved DID numbers.
  • Manage the routing of incoming calls determined by the number dialed & control the min(s) and max(s) of calls for trunk groups directly from the PBX.
  • Line hunting routes incoming calls to the next available line.
  • View the full selection of features available on our PRI.

More Features



Touch Tone Dialing
Last Call Return  
Auto Recall  
Call Trace  
Selective Call Rejection  
Per Call Privacy  
Speed Dial  
Conference Calling – 3-way  
Call Transfer  
Call Waiting  
Call Forward Busy  
Call Forward No Answer  
Call Forward Universal  
Calling Name Display  
Calling Number Display  
Toll Restriction  
Remote Call Forward Access   Additional fees may apply
Voice Mail with Message Waiting Indication   Additional fees may apply
Hunting   On request
Outbound Name Display  
Outbound Number Display  
Dialed Number Identification (DNI)  
Advance Routing and Call Overflow  

Frequently Asked Questions



How many channels will the ISDN PRI support? The ISDN PRI line supports up to 23 B-Channels for voice and one D-Channel for data (23 simultaneous calls either incoming or outgoing).
Can I have Convergia’s Long Distance service on my ISDN PRI? Yes, you may add the same long distance service and enjoy the savings and other benefits of Convergia’s long distance service.
Is Call Waiting available with the ISDN PRI? No, Call Waiting can only be activated on non-hunting lines. However your phone system may support it; call usm and we will be happy to assist you.
Must I upgrade my phone system when switching to ISDN PRI? It depends; if your current phone system is compatible with a PRI card, you won’t need to upgrade; if you aren’t sure, call us and we’ll help you figure it out.
Will my PRI work with an analog card? No, the PRI requires a digital card.
Can I use Fax capabilities on my PRI line? Yes, ISDN PRI supports fax capabilities with a Fax Interface Card for your PBX.
Can I transfer from VOIP to ISDN PRI? Yes, if your phone system is PRI compatible, a PRI will be installed, replacing VOIP. We will port the number to the PRI as your pilot number.

¿Why do business with Convergia?

One single bill
International presence
High quality at the right price
We have Consultants who understand your market and your challenges

We have Consultants who understand your market and your challenges. Request a specialist

Simply send us an e-mail or call us toll-free at 1-888-369-3669 and one of our Dedicated Account Managers will call you to schedule a free on-site review of your telecom services.



What is a Voice PRI Line?

A Primary Rate Interface line (PRI) is a form of ISDN (Integrated Services Digital Network) line, which is a standard telecommunication phone line, that enables traditional phone lines to carry voice, data, video and others.

A Voice PRI line can receive or send 23 calls simultaneously. A PRI line is an end to end digital circuit, so the voice quality is much better than analog trunk lines.

The PRI circuit consists of two pairs of copper lines terminating on a modem from a service provider company to the customer’s office.

Advantages of PRI Lines

1. Flexibility in managing incoming and outgoing calls.

2. Direct Inward Dialling (DID) provides direct access for external callers to different employees without the need for an operator.

3. Easy transfer of outside calls to an outside number.

4. PRI lines can be used for voice connectivity, video conferencing, faxing and data transfere.

5. All of the essential features at no extra charge: Call Display, Call Forwarding, Call Waiting, Three-way calling and many other features

6. In addition to many other features