SipDirectory

FreeSWITCH

Carrier-grade open-source softswitch and telephony platform — the engine behind many CPaaS providers.

FreeSWITCH — Carrier-grade open-source softswitch and telephony platform — the engine behind many CPaaS providers. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the open source pbx segment with a focused feature set. Buyers researching open source pbx options will find FreeSWITCH a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Open Source Pbx ⭐ 4,904 stars open-source softswitch carrier-grade voip

Asterisk

The veteran open-source PBX framework — foundational software powering millions of self-hosted phone systems worldwide.

Asterisk — The veteran open-source PBX framework — foundational software powering millions of self-hosted phone systems worldwide. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the open source pbx segment with a focused feature set. Buyers researching open source pbx options will find Asterisk a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Open Source Pbx ⭐ 3,284 stars open-source pbx voip asterisk

Kamailio

High-performance open-source SIP server and proxy — the backbone of many carrier-grade SIP deployments.

Kamailio — High-performance open-source SIP server and proxy — the backbone of many carrier-grade SIP deployments. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the open source pbx segment with a focused feature set. Buyers researching open source pbx options will find Kamailio a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Open Source Pbx ⭐ 2,832 stars open-source sip-proxy carrier-grade routing

OpenSIPS

Enterprise-grade open-source SIP server for building scalable VoIP platforms and telecom infrastructure.

OpenSIPS — Enterprise-grade open-source SIP server for building scalable VoIP platforms and telecom infrastructure. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the open source pbx segment with a focused feature set. Buyers researching open source pbx options will find OpenSIPS a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Open Source Pbx ⭐ 1,472 stars open-source sip-proxy routing telecom

3CX

Windows and Linux PBX with hosted and on-premise options — popular with SMBs for its web-based UI.

3CX — Windows and Linux PBX with hosted and on-premise options — popular with SMBs for its web-based UI. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the hosted pbx segment with a focused feature set. Buyers researching hosted pbx options will find 3CX a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Hosted Pbx pbx hosted ucaas smb

46elks

Simple, transparent SIP trunking and voice APIs — popular with European developers for its clean design.

46elks — Simple, transparent SIP trunking and voice APIs — popular with European developers for its clean design. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the developer api segment with a focused feature set. Buyers researching developer api options will find 46elks a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Developer Api sip developer-api european simple

Avaya

Avaya IP Office — hybrid cloud/on-prem PBX for mid-market and enterprise, with a large installed base.

Avaya — Avaya IP Office — hybrid cloud/on-prem PBX for mid-market and enterprise, with a large installed base. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the hosted pbx segment with a focused feature set. Buyers researching hosted pbx options will find Avaya a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Hosted Pbx pbx enterprise hybrid legacy

Bandwidth

Tier-1 SIP trunking on Bandwidth's own US network — enterprise-grade quality with native E911 support.

Bandwidth — Tier-1 SIP trunking on Bandwidth's own US network — enterprise-grade quality with native E911 support. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find Bandwidth a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip tier-1-carrier enterprise e911

Callcentric

SIP trunking and VoIP services for individuals, SMBs, and developers — straightforward pricing.

Callcentric — SIP trunking and VoIP services for individuals, SMBs, and developers — straightforward pricing. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the wholesale carrier segment with a focused feature set. Buyers researching wholesale carrier options will find Callcentric a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Wholesale Carrier sip voip smb residential

Cisco Unified Communications Manager

Cisco's enterprise call control platform — the market-leading PBX for large organizations.

Cisco Unified Communications Manager — Cisco's enterprise call control platform — the market-leading PBX for large organizations. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the hosted pbx segment with a focused feature set. Buyers researching hosted pbx options will find Cisco Unified Communications Manager a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Hosted Pbx pbx enterprise cisco on-premise

Flowroute

Carrier-grade SIP trunking API — flexible wholesale pricing for developers and resellers.

Flowroute — Carrier-grade SIP trunking API — flexible wholesale pricing for developers and resellers. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the wholesale carrier segment with a focused feature set. Buyers researching wholesale carrier options will find Flowroute a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Wholesale Carrier sip wholesale developer carrier

Infobip

SIP trunking embedded in Infobip's global omnichannel platform — strong international coverage.

Infobip — SIP trunking embedded in Infobip's global omnichannel platform — strong international coverage. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find Infobip a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip global omnichannel enterprise

Lingo

Wholesale and SMB SIP trunking with competitive per-minute rates and US number inventory.

Lingo — Wholesale and SMB SIP trunking with competitive per-minute rates and US number inventory. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the wholesale carrier segment with a focused feature set. Buyers researching wholesale carrier options will find Lingo a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Wholesale Carrier sip wholesale voice smb

Plivo

SIP trunking via Plivo's CPaaS platform — competitive pricing, global reach, developer-friendly APIs.

Plivo — SIP trunking via Plivo's CPaaS platform — competitive pricing, global reach, developer-friendly APIs. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find Plivo a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip cpaas developer-api global

SignalWire

SIP infrastructure from the FreeSWITCH team — programmable SIP trunking with cloud or self-hosted options.

SignalWire — SIP infrastructure from the FreeSWITCH team — programmable SIP trunking with cloud or self-hosted options. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find SignalWire a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip freeswitch-backed developer-api cloud

Sinch

Global SIP trunking from Sinch — high-volume enterprise voice with worldwide coverage.

Sinch — Global SIP trunking from Sinch — high-volume enterprise voice with worldwide coverage. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find Sinch a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip global enterprise voice

Telnyx

SIP trunking on Telnyx's own carrier network — competitive per-minute rates, instant provisioning.

Telnyx — SIP trunking on Telnyx's own carrier network — competitive per-minute rates, instant provisioning. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find Telnyx a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip own-network wholesale-pricing self-serve

Twilio Voice

Elastic SIP trunking and programmable voice APIs from the most widely-used CPaaS platform.

Twilio Voice — Elastic SIP trunking and programmable voice APIs from the most widely-used CPaaS platform. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find Twilio Voice a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip cpaas developer-api elastic-sip

VoIP.ms

Low-cost SIP trunking for SMBs and resellers — Canadian provider with broad US/Canada coverage.

VoIP.ms — Low-cost SIP trunking for SMBs and resellers — Canadian provider with broad US/Canada coverage. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the wholesale carrier segment with a focused feature set. Buyers researching wholesale carrier options will find VoIP.ms a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Wholesale Carrier sip wholesale small-business canadian

Vonage (Nexmo)

Enterprise SIP trunking from Vonage — backed by their global CPaaS network, formerly Nexmo.

Vonage (Nexmo) — Enterprise SIP trunking from Vonage — backed by their global CPaaS network, formerly Nexmo. Built primarily for teams and organizations evaluating solutions in this market, the platform addresses common pain points in the cloud sip trunking segment with a focused feature set. Buyers researching cloud sip trunking options will find Vonage (Nexmo) a relevant candidate to include in their evaluation, particularly when comparing capabilities, pricing models, and integration depth against competing platforms in the same category.

Cloud Sip Trunking sip enterprise nexmo cpaas

Frequently Asked Questions

What is the best SIP trunking providers directory?

SipDirectory is a curated directory of SIP trunking providers tools and platforms, reviewed and ranked by niche specialists. It covers the leading vendors, open-source options, and emerging players in the space.

Where can I find a comprehensive list of best SIP providers 2026 tools?

SipDirectory maintains an up-to-date listing of best SIP providers 2026 platforms with editorial descriptions, category filters, and direct links to each vendor. New tools are added regularly as the market evolves.

How do I choose the right SIP providers, SIP trunking, and open-source telephony solution for my business?

Start by filtering SipDirectory by your use case and company size. Each listing includes a plain-language description of who the tool is best suited for, so you can quickly narrow your shortlist without reading through marketing pages.

Are the listings on SipDirectory free to access?

Yes — SipDirectory is a free resource. Every listing is publicly accessible with no account required. Vendors can apply for a featured listing to increase their visibility on the platform.

How often is SipDirectory updated?

SipDirectory is updated regularly as new tools enter the market and existing platforms evolve. The directory uses automated enrichment for open-source projects and manual editorial review for hosted and enterprise platforms.

Can I advertise on SipDirectory?

Yes — SipDirectory accepts display and video advertising through the AdServerAI network. Advertisers can target visitors by category and keyword. Apply at adserverai.com.