Phone
ISDN PRI
Up to 30 simultaneous voice channels on a single digital circuit, delivered over IP for legacy PBX systems that need a PRI hand-off.
- 30 channels per E1
- Guaranteed capacity
- Fiber delivered
Overview
Dedicated digital voice lines with 30 channels per circuit.
Enterprise-grade Primary Rate Interface lines delivered over fiber. Ideal for organizations with traditional PBXs that need guaranteed voice capacity.
- DID ranges
- Hunt groups
- Clear audio
- Stackable
Benefits
What ISDN PRI changes for your business
Dedicated capacity
Every channel is yours, no contention.
Proven technology
Works with any PRI-capable PBX out of the box.
Monitored lines
Proactive fault detection from our NOC.
Capabilities
Included with the service
DID ranges
Blocks of direct numbers for every employee.
Hunt groups
Distribute calls across multiple PRI circuits.
Clear audio
Toll-quality digital voice end to end.
Stackable
Bond multiple E1s for larger capacity.
Use cases
Built for the way you operate
Financial institutions
Reliable lines for trading and branch desks.
Healthcare
Always-on lines for emergency departments.
Government
Secure dedicated voice infrastructure.
Onboarding
Ready to begin? Three simple steps.
01
Tell us what you need
Share your sites, seat count and the numbers you want to keep. A specialist maps the right service.
02
We design and provision
Survey, configuration and number porting are handled by our engineers. Most cloud services go live the same day.
03
Stay supported, 24/7
The network operations center monitors the service, and your account team stays on the line after go-live.
FAQ
Questions about ISDN PRI
A specialist can walk through pricing, coverage and porting on a short call.
How long does it take to activate ISDN PRI?
Most services are provisioned within 2 to 5 business days after the site survey and paperwork are complete. Cloud-only services are usually live the same day.
Is there a long-term contract?
We offer monthly, annual and multi-year terms. Longer terms unlock lower monthly pricing and priority support.
What support do I get?
Every business account includes 24/7 support from our network operations center, with a dedicated account manager for enterprise customers.
Related
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Contact
Let's get in touch
Questions, a custom quote, or a coverage check — send a note and the team will reply within one business day.
Switch to Altaris and keep every number you already have.
Free number porting, white-glove onboarding and a 30-day money-back guarantee. Most teams are live the same day.