SignalWire SIP Trunking

At a glance

• Editor score
  Not yet scored
• Pricing
  From $0.50/mo
• Best for
  Developers integrating SIP calling and number services
• Paid from
  $0.5/mo
• Founded
  2017 · Palo Alto, California, USA
• Facts checked
  19 Sep 2026

• Where it wins

  • Create SIP endpoints by API or dashboard and associate SignalWire numbers
  • Route calls between SIP endpoints and the PSTN
  • TLS signaling, SRTP media, and dashboard call and cost logs

• Where it doesn't

  • The $0.50 monthly starting price is for a local number, not a trunk plan
  • Toll-free support lacks detailed toll-free management and routing information
  • SIP usage is billed separately from monthly local-number charges

Our verdict on SignalWire SIP Trunking

SignalWire SIP Trunking connects existing PBXs, IP phones, softphones, mobile applications, and IoT devices to SIP endpoints and the public switched telephone network. Developers can create SIP credentials through an API or dashboard, associate SignalWire phone numbers with endpoints, and configure device connection settings. It is a fit for teams integrating calling into their systems; buyers looking for toll-free-specific management detail should compare alternatives before choosing it.

Pricing is usage-based alongside a monthly number charge, rather than a bundled trunk plan. According to SignalWire's pricing details, local numbers start at $0.50 per month, while SIP usage is billed per inbound or outbound minute. E911 service is also listed as a monthly charge. That distinction matters: the $0.50 starting price covers a local DID, not the complete cost of a calling setup. Buyers should account for number, call usage, and any applicable E911 charges separately when estimating spend.

The service's strongest fit is technical integration and configurable connectivity: administrators can set SIP server, ports, transport protocols, and outbound proxy settings, while TLS protects signaling and SRTP secures media. Dashboard logs show call activity along with resource and cost details. Toll-free number support is verified, but the published feature detail centers on general SIP endpoints and phone-number association, not toll-free-specific routing or management. Choose it when SIP-to-PSTN control and configurable endpoints are the priority; consider another service if detailed toll-free workflows are central to the buying decision.

SignalWire SIP Trunking pricing

SignalWire SIP Trunking fact sheet

SignalWire SIP Trunking integrations

SignalWire SIP Trunking lists 6 integrations on its own site.

• PBX systems
• IP phones
• softphones
• mobile applications
• IoT devices
• PSTN

Alternatives to SignalWire SIP Trunking

• RingCentral RingEXA broad cloud phone system with toll-free numbers, IVR, messaging and video.5.0
• Telnyx Toll-Free NumbersProgrammable toll-free numbers start at $1 per number monthly, with voice, porting and messaging options.6.5
• GrasshopperGrasshopper pairs toll-free numbers with calling, texting and call-management tools.4.8

See all SignalWire SIP Trunking alternatives →

Featured on iTechGuides

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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