Callcentric SIP Trunking

Overview

Callcentric SIP Trunking’s Pay Per Call plan is an outbound calling option for businesses using SIP-based IP PBXs or gateways. Calls can be placed worldwide, with charges based on variable per-minute rates. There is no monthly fee, no included minutes, and no commitment; the account deposit can be as low as $5.00. Calls to other Callcentric members are free.

The plan includes three concurrent channels and supports unlimited maximum channels, with a $0.00 additional channel fee. It is outbound-only. Callcentric offers business numbers in the USA, Canada, and more than 35 other countries. Number porting, emergency calling, and toll-free numbers are available.

Pay Per Call lists business and office use, call centers, IVR services, calling card providers, and any purpose among its supported usage types. The company was founded in 2001 and is headquartered in New York, New York.

Key features

Bring your own SIP equipment

Callcentric says most SIP/2.0 hardware and software should be compatible and does not restrict customers to equipment it is comfortable with. Its compatibility FAQ names 3CX, Asterisk, freePBX, Bria, ZoIPer, and LinPhone as software users have successfully used.

For compatible devices, the listed requirements include SIP 2.0, RTP over UDP, DIGEST MD5 authentication, a fixed outbound proxy, DNS SRV, and G.711 and/or G.729. Businesses should check that their chosen PBX, gateway, or software meets those requirements.

Account controls and privacy

Account protections include the ability to limit calling destinations and whitelist IP addresses either globally or per extension. Callcentric advises using complex passwords. It says it does not listen in on calls or have access to users’ login passwords.

There is an important encryption limitation: Callcentric does not support audio or SIP communications using RTPS or SIPS. It says credentials are encrypted during REGISTER and INVITE according to SIP, but encrypted signaling is not listed as a supported feature.

Support and numbers

Callcentric provides a maintained knowledge base, BYOD setup guides, and free support through trouble tickets. US/Canada toll-free numbers are listed at $3.95 setup and $3.95 per month. Pricing for US/Canada and international phone numbers varies by product or country.

Pricing

Pay Per Call is a freemium plan with a $0.00 monthly charge, billed month to month at $0.00. Calling costs vary by destination and are charged per minute; there are no included minutes. The account deposit can be as low as $5.00. Three channels are included, maximum channels are unlimited, and additional channels cost $0.00 each. A free plan is available, but there is no free trial.

Number add-ons have separate pricing. US/Canada toll-free numbers cost $3.95 for setup and $3.95 per month; other US/Canada and international number prices vary.

Platforms

Listed platforms are Android, iOS, Linux, macOS, Windows, web, extension, and self-hosted. Compatibility also depends on the SIP requirements Callcentric lists for devices and software.

Who it's for

This service may suit businesses that need outbound calling from a SIP-based PBX or gateway and want usage-based calling rather than a monthly plan with included minutes. Its stated usage types range from offices and call centers to IVR and calling card services. Businesses should account for variable per-minute charges, the outbound-only plan, and the limits on encrypted audio and SIP transport when deciding whether it fits their needs.

Pros and cons

Pros

• No monthly fee or commitment for Pay Per Call, with an account deposit as low as $5.00.
• Three included concurrent channels, unlimited maximum channels, and no additional channel fee.
• Broad BYOD compatibility claims and named software examples.
• Number porting, emergency calling, and toll-free numbers are supported.
• Free support is available through trouble tickets, alongside setup guides and a knowledge base.

Cons

• There are no included minutes, and per-minute calling prices vary.
• The plan is outbound-only.
• RTPS and SIPS communications are not supported.
• Phone-number pricing varies by product or country, aside from the listed toll-free price.

Alternatives

For a broader category view, see SIP Trunking Providers. Other options include IPComms SIP Trunking, SIP.US Cloud SIP Trunking, Callivex SIP Trunking, and Flowroute. The directory also lists Twilio Segment, Telnyx Text-to-Speech API, Bandwidth Messaging API, and Dollu CCaaS.

Verdict

Callcentric Pay Per Call makes its cost structure straightforward at the monthly level: the plan costs $0.00 per month and has no included minutes, so outbound usage drives calling charges. Its channel allowance, broad stated SIP compatibility, and available business numbers make it a practical option to consider for organizations already using SIP equipment. Before choosing it, verify device requirements, estimate destination-based calling costs, and weigh the lack of RTPS and SIPS support against your security needs.