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Callcentric SIP Trunking

callcentric.com

From $1.95/mo Free plan WebWindowsmacOSLinuxiOSAndroid
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Spec score 9.3 #1 of 27 in SIP Trunking Providers

What it is

Callcentric SIP Trunking's Pay Per Call plan lets businesses place worldwide calls from SIP-based IP PBXs or gateways. The plan has no monthly fee or included minutes; outbound calls are charged at variable per-minute rates, while calls to other Callcentric members are free. It includes three channels, allows unlimited maximum channels and charges no additional channel fee. An account deposit can be as low as $5.00. Business numbers are available in the USA, Canada and over 35 other countries. Listed uses include offices, call centers, IVR services and calling card providers. Callcentric says most SIP/2.0 hardware and software should be compatible, and names 3CX, Asterisk, freePBX, Bria, ZoIPer and LinPhone among options users have used. Compatible devices need specified SIP, RTP, authentication, proxy, DNS and codec support. The service supports Android, iOS, Linux, macOS, web, Windows, extensions and self-hosted setups. US/Canada toll-free numbers are listed at $3.95 setup and $3.95 per month.

Spec sheet

What it does
Callcentric provides VoIP service for residential and business customers using SIP software, ATAs, IP phones or IP PBX systems over broadband internet.Read 14 Oct 2026 · callcentric.com
Integrations
Official setup coverage includes 3CX, Asterisk, Zoiper, Bria Solo, Grandstream, Yealink, Cisco, Polycom, Snom, Linksys, Obihai and other SIP devices.Read 14 Oct 2026 · callcentric.com
Privacy
The privacy policy says personally identifiable information is collected for registration, provisioning, troubleshooting, billing and fraud detection, and is not shared without consent except for legal or safety reasons.Read 14 Oct 2026 · callcentric.com
Support
Callcentric provides a maintained knowledge base, BYOD setup guides, and free support through trouble tickets.Read 30 Sep 2026 · callcentric.com
Headquarters
New York, New York, USARead 28 Sep 2026 · callcentric.com
Founded
2001Read 28 Sep 2026 · callcentric.com
API availability
Callcentric says it does not currently provide APIs for its SMS services.Read 14 Oct 2026 · callcentric.com
App update
Google Play lists the Callcentric SMS Android app as updated on May 5, 2026.Read 14 Oct 2026 · play.google.com
Asterisk support
Callcentric publishes PJSIP configuration examples, registration parameters and network match ranges for Asterisk PBX deployments.Read 14 Oct 2026 · callcentric.com
Business numbers
Callcentric offers business phone numbers in the USA, Canada, and over 35 other countries.Read 30 Sep 2026 · callcentric.com
BYOD
Callcentric supports bring-your-own-device deployments rather than requiring a specific phone or PBX.Read 14 Oct 2026 · callcentric.com
BYOD compatibility
Callcentric says most SIP/2.0 hardware and software should be compatible and that it does not restrict customers to only equipment it is comfortable with.Read 30 Sep 2026 · callcentric.com
Calling costs
The plan has no monthly fee and no included minutes; per-minute prices vary, and calls to other Callcentric members are free.Read 30 Sep 2026 · callcentric.com
Calling features
The feature catalog includes call forwarding, call hunting, call treatments, simultaneous ringing, IVR, voicemail, fax reception, caller-ID controls and network-down forwarding.Read 14 Oct 2026 · callcentric.com
Company history
Callcentric says it was founded in 2001, began providing VoIP to end users in 2005 and belongs to the Callcentric Wholesale group.Read 14 Oct 2026 · callcentric.com
Compatibility
The provider states that most SIP/2.0 software is compatible and lists open-source and proprietary clients including Asterisk, freePBX, LinPhone and Acrobits.Read 14 Oct 2026 · callcentric.com
Documentation
The support center contains FAQs and bring-your-own-device guides for adapters, IP phones, PBXs, desktop softphones and mobile softphones.Read 14 Oct 2026 · callcentric.com
Encryption limitation
Callcentric states that it does not support encrypted SIP or audio connections using SIPS or SRTP.Read 14 Oct 2026 · callcentric.com
Independent limitation
The same Broadband Bulletin discussion says there is no export/import function for call treatments and related settings.Read 14 Oct 2026 · broadbandbulletin.com
Independent praise
A 2025 Broadband Bulletin user reports reliable home and business service, extensive documentation, flexible plans, good porting and effective call-treatment features.Read 14 Oct 2026 · broadbandbulletin.com
Limit: Android SMS app
The Android listing excludes MMS, attachments, group messages and international SMS, while a reviewer reports delayed message refresh that can hinder two-factor-code use.Read 14 Oct 2026 · play.google.com
Limit: iOS SMS app
The iOS app does not support MMS, group messages or international SMS numbers, and reviewers report limited synchronization across devices.Read 14 Oct 2026 · apps.apple.com
Limit: setup complexity
Independent reviewers report that configuring an ATA or PBX and understanding separate inbound and outbound purchases can be confusing for beginners.Read 14 Oct 2026 · voipreview.org
Limit: support complaints
Some VoIPReview and WhichVoIP reviewers report ticket-only support, slow responses and difficulty resolving outages or configuration problems.Read 14 Oct 2026 · voipreview.org
Limit: Trustpilot pricing
One Trustpilot reviewer calls an international number relatively expensive at $8 monthly plus an $8 setup fee.Read 14 Oct 2026 · trustpilot.com
Limit: WhichVoIP review
The review site says users must configure and purchase their own hardware, there is no remote provisioning, plans are split between inbound and outbound services, and no annual plans are offered.Read 14 Oct 2026 · whichvoip.com
Named integrations
The compatibility FAQ lists 3CX, Asterisk, freePBX, Bria, ZoIPer, and LinPhone among software users have successfully used.Read 30 Sep 2026 · callcentric.com
No commitment
The page describes Pay Per Call as having no monthly fees and no commitments, with an account deposit as low as $5.00.Read 30 Sep 2026 · callcentric.com
Number add-ons
US/Canada toll-free numbers are listed at $3.95 setup and $3.95 per month; US/Canada and international phone number pricing varies by product or country.Read 30 Sep 2026 · callcentric.com
Phone numbers
The service offers US and Canadian numbers, international numbers, toll-free numbers, alternate numbers and number porting.Read 14 Oct 2026 · callcentric.com
Praise: Trustpilot reviewers
Trustpilot reviewers describe the SIP trunk as reliable and praise responsive support and timely number delivery.Read 14 Oct 2026 · trustpilot.com
Praise: VoIPReview reviewers
Reviewers highlight high call quality, extensive features, low prices and flexible call-treatment rules.Read 14 Oct 2026 · voipreview.org
Praise: WhichVoIP reviewers
Reviewers repeatedly praise voice quality, flexible unbundled plans, broad SIP-device compatibility, features and support documentation.Read 14 Oct 2026 · whichvoip.com
Privacy and call access
Callcentric says it does not listen in on calls or have access to users' login passwords.Read 30 Sep 2026 · callcentric.com
Rating on Apple App Store
4.7 out of 5 from 204 ratings for Callcentric SMS.Read 14 Oct 2026 · apps.apple.com
Rating on GetVoIP
3.8 out of 5 from 10 reviews; 70% would recommend.Read 14 Oct 2026 · getvoip.com
Rating on Google Play
4.3 out of 5 from 279 displayed reviews for Callcentric SMS.Read 14 Oct 2026 · play.google.com
Rating on Trustpilot
3.8 out of 5 from 2 reviews.Read 14 Oct 2026 · trustpilot.com
Rating on VoIPReview
4.1 out of 5 from 65 reviews, with 73% recommending the provider.Read 14 Oct 2026 · voipreview.org
Rating on WhichVoIP
4.3 out of 5 from 56 reviews; 79% recommended.Read 14 Oct 2026 · whichvoip.com
Security controls
Listed account protections include allowed calling areas, IP whitelisting, maximum call-rate limits and two-point authentication.Read 14 Oct 2026 · callcentric.com
SIP trunking
The SIP-trunking service lets any SIP-capable IP PBX place worldwide calls through the Pay Per Call plan and offers DIDs in the USA, Canada and more than 35 other countries.Read 14 Oct 2026 · callcentric.com
Support model
Support is provided through a knowledge base and account trouble tickets, and the company says support is free for all customers.Read 14 Oct 2026 · callcentric.com
Supported device requirements
For compatible devices, the FAQ lists SIP 2.0, RTP over UDP, DIGEST MD5 authentication, a fixed outbound proxy, DNS SRV, and G.711 and/or G.729.Read 30 Sep 2026 · callcentric.com
System requirements
SIP registration uses sip.callcentric.net with account credentials and port 5060; RTP ports must also be allowed through the firewall.Read 14 Oct 2026 · callcentric.com
Transport encryption limit
Callcentric says it does not support audio or SIP communications using RTPS or SIPS, while secure credentials are encrypted during REGISTER and INVITE according to SIP.Read 30 Sep 2026 · callcentric.com
Use cases
The Pay Per Call plan lists business and office, call centers, IVR services, calling card providers, and any purpose as supported usage types.Read 30 Sep 2026 · callcentric.com

Plans and prices

IP Freedom Free Monthly Unlimited free calling to Callcentric customers · 0 included minutes · no setup fee Read 14 Oct 2026 · callcentric.com
Pay Per Call Free Monthly; prepaid balance required Worldwide per-minute pricing · 3 included channels · unlimited maximum channels · $5 minimum deposit Read 14 Oct 2026 · callcentric.com
North America Basic $1.95 a month Monthly 120 minutes to USA, Canada and Puerto Rico · E911 included · $1.50 setup fee Read 14 Oct 2026 · callcentric.com
US/Canada Toll Free number $3.95 a month Monthly plus $3.95 setup Toll-free number product Read 14 Oct 2026 · callcentric.com
North America 500 $6.95 a month Monthly 500 minutes to USA, Canada and Puerto Rico · E911 included · $1.50 setup fee Read 14 Oct 2026 · callcentric.com
North America 1000 $12.95 a month Monthly 1,000 minutes to USA, Canada and Puerto Rico · E911 included · $1.50 setup fee Read 14 Oct 2026 · callcentric.com
North America 2500 $29.95 a month Monthly 2,500 minutes to USA, Canada and Puerto Rico · E911 included · $1.50 setup fee Read 14 Oct 2026 · callcentric.com

Every Callcentric SIP Trunking plan and price →

Strong points and limits

Strong points

  • No monthly fee and no included-minute restriction.
  • Three included channels with unlimited maximum channels.
  • Calls to other Callcentric members are free.
  • Free support through trouble tickets is available.

Limits

  • No minutes are included in the plan.
  • Per-minute calling prices vary.
  • Audio and SIP communications using RTPS or SIPS are unsupported.
  • Toll-free numbers cost $3.95 setup and $3.95 per month.

Who it suits

It suits businesses that want outbound SIP trunking with variable per-minute calling costs and no monthly plan fee. It may also fit users with compatible SIP equipment who need business numbers in the listed countries.

Callcentric SIP Trunking in depth

Read the full write-up

Overview

Callcentric SIP Trunking’s Pay Per Call plan connects SIP-based PBXs and gateways to worldwide outbound calling. It best suits businesses that can manage their own SIP equipment and want usage-based calling rather than a monthly trunk charge. Its low fixed cost is appealing, but destination-based rates and the lack of encrypted SIP or audio transport make it a poor fit when predictable calling costs or transport encryption are requirements.

Key features

Bring your own SIP equipment

Callcentric says most SIP/2.0 hardware and software should work, without restricting customers to equipment it has chosen. Its FAQ names 3CX, Asterisk, freePBX, Bria, ZoIPer, and LinPhone as software users have successfully used. That flexibility can suit businesses with an existing PBX, but compatibility depends on meeting the service’s technical requirements: SIP 2.0, RTP over UDP, DIGEST MD5 authentication, a fixed outbound proxy, DNS SRV, and G.711 and/or G.729.

Controls and support

Calling destinations can be restricted, and IP whitelisting can be applied globally or per extension. Callcentric advises using complex passwords. It says it cannot access users’ login passwords and does not listen in on calls, but it does not support audio or SIP communications using RTPS or SIPS. Secure credentials are encrypted during REGISTER and INVITE; that is not a substitute for encrypted call audio or SIP transport. Businesses that require those protections should look elsewhere.

A maintained knowledge base, BYOD setup guides, and free support through trouble tickets help customers handle setup without a monthly support charge. The supported-use list spans business and office calling, call centers, IVR services, calling card providers, and any purpose.

Pricing

Pay Per Call costs nothing, billed month to month at $0.00. There is no monthly fee, no commitment, and no included minutes; outbound calling is charged at variable per-minute rates. Calls to other Callcentric members are free, and the account deposit can be as low as $5.00. This structure keeps the fixed cost low for sporadic callers, but users need to account for destination-specific usage charges rather than expect a bucket of included minutes.

The plan is outbound-only, with three included concurrent channels, unlimited maximum channels, and a $0.00 additional channel fee. It includes zero minutes. Toll-free numbers are supported; US/Canada toll-free numbers cost $3.95 setup and $3.95 per month. US/Canada and international number prices vary by product or country. Number porting and emergency calling are supported.

Platforms

Callcentric lists Android, iOS, Linux, macOS, Windows, web, extension, and self-hosted platforms. The service’s BYOD approach makes the SIP requirements more useful as a compatibility check than a guarantee that every device on those platforms will work.

Who it's for

Pay Per Call is a sensible match for organizations with a compatible SIP PBX or gateway, low or variable outbound volumes, and a preference for avoiding a recurring trunk fee. Its three included channels and no-fee additional channels can accommodate more concurrent calling, while per-minute billing leaves costs tied to usage. It is less suitable for teams needing included minutes, inbound trunking under this plan, or encrypted SIP and audio transport.

Pros and cons

Pros: No monthly plan charge or commitment, and deposits can start at $5.00, limiting the upfront commitment for usage-based outbound calling.

Pros: Three included channels, unlimited maximum channels, and no additional channel fee offer room to scale concurrent calls without a channel surcharge.

Pros: Broad BYOD compatibility and named integrations can serve businesses already running SIP software or hardware.

Cons: No included minutes and variable per-minute rates make the total bill depend on destinations and usage.

Cons: The plan is outbound-only, so it is not a complete inbound trunk plan.

Cons: RTPS and SIPS are unsupported, which rules it out for businesses that require encrypted audio or SIP transport.

Alternatives

For a direct comparison of providers, start with SIP Trunking Providers. Choose SIP.US Cloud SIP Trunking if you want a paid service with a free trial and priced local DID and enhanced DID plans. BulkVS SIP Trunking is another paid option, with outbound and inbound voice billed per minute and US and Canadian numbers noted for inbound voice. Consider IPComms SIP Trunking for a freemium, trial-offering alternative described as usage-billed from a prepaid balance, with no trunk or channel fees and no contract. Sangoma Carrier Voice is a paid option with wholesale, usage-based and à la carte services and no large minimums or long-term contracts; pricing is custom. Anveo Direct is another paid SIP option. For messaging rather than SIP trunking, Bandwidth Messaging API offers SMS plans billed per message. Twilio Segment and Telnyx Text-to-Speech API are also alternatives in adjacent software categories.

Verdict

Choose Callcentric Pay Per Call if you have a compatible SIP system, want worldwide outbound calling without a monthly trunk charge, and can accept variable per-minute billing. Its low fixed commitment and channel terms are the draw; look elsewhere if your service must include minutes, handle inbound calls under the same plan, or encrypt SIP and audio transport.

Verdict

Pay Per Call offers outbound SIP calling without a monthly plan charge, but call costs vary by destination and usage. Check device requirements and the transport-encryption limit before relying on it.

Where Specifiction places it

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