Twilio Elastic SIP Trunking vs Bandwidth Voice API

Twilio Elastic SIP Trunking9.2Visit Bandwidth Voice API9.1Visit

Higher score Twilio Elastic SIP Trunking #2 in Voice APIs 9.2/10 Paid ✓ 0 of 5 features Visit Twilio

vs

Bandwidth Voice API #3 in Voice APIs 9.1/10 Pricing on request ✓ 5 of 5 features Visit Bandwidth

• Twilio Elastic SIP Trunking fits best

  Businesses connecting SIP infrastructure to PSTN

• Bandwidth Voice API fits best

  Mature PSTN voice and media streaming projects

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Side by side

Feature	Twilio Elastic SIP Trunking 9.2/10 Visit ↗	Bandwidth Voice API 9.1/10 Visit ↗
At a glance
Editor score	9.2	9.1
Ranking	#2 in Voice APIs	#3 in Voice APIs
Best for	Businesses connecting SIP infrastructure to PSTN	Mature PSTN voice and media streaming projects
Pricing model	Paid	Paid
Starting price	—	Pricing on request
Free plan	—	—
Free trial	—	—
Deployment	Cloud	Cloud
Features Twilio Elastic SIP Trunking 0/5 · Bandwidth Voice API 5/5
Inbound calling	Not checked yet	✓ (best)
Outbound calling	Not checked yet	✓ (best)
Phone number support	Not checked yet	✓ (best)
SIP support	Not checked yet	✓ (best)
Call recording	Not checked yet	✓ (best)
Specs
Concurrent call limit	Not checked yet	Not checked yet
SDK languages	Not checked yet	C#, Java, Node.js, PHP, Python, Ruby
Our review
Pros	Handles inbound origination and outbound termination to the PSTN Includes unlimited call concurrency and TLS/SRTP Secure Trunking Supports recording, emergency addresses, and disaster recovery URLs	Inbound and outbound PSTN calling with REST APIs, webhooks, and BXML Voice, transcription, recording, conferencing, and answering-machine detection WebSocket media streaming with OpenAI Realtime API integration
Cons	Voice usage is billed per minute in addition to phone-number charges Geographic route pricing varies by country Focused on SIP-to-PSTN connectivity rather than a full voice application API	Paid service with usage-based rates rather than a conventional monthly plan No permanent $0 Voice API plan API-only access requires development work to build user-facing workflows
Our verdict	Twilio Elastic SIP Trunking connects IP-based communications infrastructure, such as an IP-PBX or session border controller, to the public switched telephone network. It supports inbound and outbound calling, making it a fit for contact… Read the review →	Bandwidth Voice API gives developers programmable inbound and outbound telephone calling through HTTPS requests, webhooks, REST APIs, and Bandwidth XML (BXML). It is aimed at businesses and software teams building IVR systems,… Read the review →

Strengths and trade-offs

• Twilio Elastic SIP Trunking — where it wins

  • Handles inbound origination and outbound termination to the PSTN
  • Includes unlimited call concurrency and TLS/SRTP Secure Trunking
  • Supports recording, emergency addresses, and disaster recovery URLs

  Where it doesn't

  • Voice usage is billed per minute in addition to phone-number charges
  • Geographic route pricing varies by country
  • Focused on SIP-to-PSTN connectivity rather than a full voice application API

• Bandwidth Voice API — where it wins

  • Inbound and outbound PSTN calling with REST APIs, webhooks, and BXML
  • Voice, transcription, recording, conferencing, and answering-machine detection
  • WebSocket media streaming with OpenAI Realtime API integration

  Where it doesn't

  • Paid service with usage-based rates rather than a conventional monthly plan
  • No permanent $0 Voice API plan
  • API-only access requires development work to build user-facing workflows

• Twilio Elastic SIP Trunking9.2/10 · Paid

  A focused SIP-to-PSTN service with secure trunking and pay-as-you-go voice charges.

  Visit TwilioFull verdict →
• Bandwidth Voice API9.1/10 · Pricing on request

  A broad PSTN voice API for calling, media control, transcription, and AI streaming.

  Visit BandwidthFull verdict →