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Frontier SIP Trunking

Paid#28 of 28 in SIP Trunking Providers

Frontier SIP Trunking: A continuity-focused SIP trunking service for traditional and IP PBX environments. Ranked #28 of 28 in SIP Trunking Providers by our editors (6.5/10); pricing: Pricing on request; best for traditional PBX users needing continuity.

6.5/10Editor score

Visit Frontier

Frontier SIP Trunking6.5 Visit Frontier

At a glance

Editor score
6.5 / 10
Pricing
Pricing on request
Best for
Traditional PBX users needing continuity
Founded
1935 · Dallas, Texas, United States
Facts checked
19 Sep 2026

Where it wins
- Supports traditional and IP PBX systems
- Offers SIP, PRI, and analog delivery options
- Includes outage redirection, porting, and optional redundancy
Where it doesn't
- Pricing is customized through sales
- Availability is limited to select areas
- Its listed integrations center on PBX systems

Our verdict on Frontier SIP Trunking

Frontier SIP Trunking connects traditional or IP PBX systems to Frontier’s voice network. It is designed for businesses that want to preserve PBX investments while adding SIP trunking capabilities, number porting, scalable call paths, and continuity options. Delivery can use SIP, PRI, or analog connections, giving traditional and IP PBX environments multiple paths into the service. The offering is particularly suited to organizations moving from legacy voice infrastructure without replacing their existing PBX platform.

Pricing is customized through sales rather than presented as a published starting price or per-minute or per-channel model. The service includes bundled long-distance minutes and telephone numbers, while call capacity can scale through additional call paths. SIP delivery can run over Frontier’s fiber Ethernet Virtual Private Line, or it can be provisioned over internet services for customers outside Frontier’s fiber footprint. Availability is limited to select areas, so location is an important consideration before choosing the service.

Continuity is a central strength. Frontier provides call redirection during outages, optional network redundancy, and 24/7/365 technical support. Its private-network call security also supports business voice deployments that prioritize network-based protection. At the same time, the listed ecosystem is focused on traditional and IP PBX connectivity rather than a wider set of business applications. Choose Frontier SIP Trunking when PBX continuity, flexible delivery, porting, and outage planning matter most. Businesses seeking a broader communications platform or transparent published pricing should consider a different type of provider.

Your product? Our editors can test Frontier SIP Trunking in depth and publish a review, labelled as paid · from $149/mo →

Frontier SIP Trunking pricing

Plans Pricing on requestPaid No free plan — trial or paid only. Prices checked 19 Sep 2026.

See plans on enterprise.frontier.com

Frontier SIP Trunking fact sheet

Free plan	Not verified
Paid from	Not verified
Pricing model	Not verified
Concurrent channels	Not verified
Number porting	Yes
Emergency calling	Not verified
Toll-free numbers	Not verified
Encrypted signaling	Not verified
Integrations	2 integrations: Traditional PBX, IP PBX
Pricing	Pricing on request
Website	enterprise.frontier.com
Facts checked	19 Sep 2026

Frontier SIP Trunking integrations

Frontier SIP Trunking lists 2 integrations on its own site.

Traditional PBX
IP PBX

Alternatives to Frontier SIP Trunking

See all Frontier SIP Trunking alternatives →

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Featured on iTechGuides

Frontier SIP Trunking is listed in our SIP Trunking Providers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update