Twilio Elastic SIP Trunking review
Programmable inbound and outbound PSTN calling with security and call-management controls.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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 origination and outbound termination, making it relevant to contact centers, unified communications systems, backup trunks, and organizations replacing ISDN PRI. Teams can provision and manage trunks through the Twilio Console or API, with unlimited call concurrency included in the Pay-as-you-go plan.
The published Pay-as-you-go plan prices termination and origination by the minute, while phone numbers are billed monthly. Local US phone numbers are listed at $1.1500 per month, and toll-free US phone numbers at $2.1500 per month; voice usage is additional, and pricing varies by country and route. Secure Trunking is included. This structure suits teams whose calling patterns benefit from usage-based billing, but buyers should account for both number charges and route-specific voice costs when estimating spend. There is no free plan.
Security and call operations are a notable part of the offering: IP access control lists and credential lists help control trunk access, while Secure Trunking provides TLS signaling and SRTP media encryption. The service also supports call recording and storage, emergency address configuration, disaster recovery URLs, Caller Name lookup, and STIR/SHAKEN. Integrations include Twilio Interconnect, Twilio Voice Insights, Twilio Programmable Messaging API, and IP-PBX and session border controller infrastructure. Choose it when programmable PSTN connectivity and these controls matter; teams seeking a free option or fixed per-channel capacity should consider alternatives.
Twilio Elastic SIP Trunking pros and cons
- Where it wins
- Unlimited call concurrency with inbound and outbound PSTN calling
- Secure Trunking includes TLS signaling and SRTP media encryption
- Console or API provisioning, with access controls and disaster recovery URLs
- Where it doesn't
- Voice usage is billed per minute, with rates varying by country and route
- Phone numbers are billed monthly in addition to voice usage
- No free plan
Twilio Elastic SIP Trunking fact sheet, pricing and score →
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