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Colt SIP Trunking

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What Colt SIP Trunking is

Colt SIP Trunking carries business voice communications over the internet, letting organizations make and receive calls through an IP PBX. Colt positions the service as a scalable voice option for enterprises and describes compatibility with leading IP PBXs and unified communications platforms. Listed interoperability includes Genesys Cloud, Cisco Webex, Talkdesk, Twilio Flex, Avaya Experience Platform, NICE CXone, Microsoft Teams and Zoom. Colt states 99.999% uptime, supported by geo-redundant architecture and automatic failover. TLS and SRTP encrypt signalling and voice media. Customers can retain existing phone numbers or get new numbers in multiple countries; porting is supported in most countries. SIP On Demand supports online requests to port or add numbers, while Colt Online can invoke or revoke services upgraded with Disaster Recovery. Listed regulatory features include emergency call routing, lawful compliance and data retention, with location-based emergency routing for local regulations. Pricing is on request. Colt says the service can reduce monthly costs by up to 50%.

Who it suits

Colt SIP Trunking is positioned for enterprises seeking internet-based calling through an IP PBX. It may suit businesses needing number porting, emergency routing or interoperability with the listed platforms.

What it does well

  • Interoperates with eight listed platforms
  • Geo-redundant architecture and automatic failover
  • TLS and SRTP encrypt signalling and voice media
  • Number porting supported in most countries
  • Location-based emergency call routing

What to know first

  • Pricing is on request
  • Number porting is supported in most countries, not all

Plans

PlanBilled and limitsPrice
Colt SIP TrunkingPricing not shown; contact ColtOn request

As colt.net lists them, read 5 Oct 2026. The maker's own page has the final word.

Getting started

  1. Visit the Colt SIP Trunking website.
  2. Contact Colt's team or talk to an expert about the service.
  3. Discuss pricing and the service requirements with Colt.

Verdict

Colt SIP Trunking combines IP PBX calling with listed integrations, encryption and number-management options. Pricing is not published, and Colt directs prospective customers to contact its team.

Questions

How much does Colt SIP Trunking cost?

Pricing is on request. Contact Colt for pricing.

Which platforms does it work with?

It interoperates with Genesys Cloud, Cisco Webex, Talkdesk, Twilio Flex, Avaya Experience Platform, NICE CXone, Microsoft Teams and Zoom. Colt also describes compatibility with leading IP PBXs and unified communications platforms.

Can businesses keep their existing phone numbers?

Yes. Customers can retain existing numbers or obtain new numbers in multiple countries. Number porting is supported in most countries.

Does the service support emergency calling?

Yes. Colt lists emergency call routing, including location-based routing to meet local regulations.

How does it protect voice calls?

The service uses TLS and SRTP to encrypt signalling and voice media.

Facts from Colt SIP Trunking's own pages

Company background
Colt says it was founded in London over 30 years ago and is privately owned. · colt.net, 5 Oct 2026
Company security certifications
Colt lists ISO/IEC 27001:2022 for information security management and ISO/IEC 27701:2019 for privacy information management. · colt.net, 5 Oct 2026
Compatibility
Colt describes the service as compatible with leading IP PBXs and unified communications platforms. · colt.net, 5 Oct 2026
Cost savings
Colt says the service can reduce monthly costs by up to 50%. · colt.net, 5 Oct 2026
Headquarters
London, United Kingdom · colt.net, 28 Sept 2026
Integrations
It interoperates with Genesys Cloud, Cisco Webex, Talkdesk, Twilio Flex, Avaya Experience Platform, NICE CXone, Microsoft Teams and Zoom. · colt.net, 5 Oct 2026
Intended customers
Colt positions SIP Trunking as a scalable voice solution for modern enterprises. · colt.net, 5 Oct 2026
Numbering
Customers can retain existing phone numbers or obtain new numbers in multiple countries, with number porting supported in most countries. · colt.net, 5 Oct 2026
Online management
SIP On Demand supports online requests to port numbers or add phone numbers, and Colt Online can invoke or revoke services upgraded with Disaster Recovery. · colt.net, 5 Oct 2026
Regulatory features
Colt lists emergency call routing, lawful compliance and data retention, and says emergency calling includes location-based routing to meet local regulations. · colt.net, 5 Oct 2026
Resilience
Colt states 99.999% uptime, supported by geo-redundant architecture and automatic failover. · colt.net, 5 Oct 2026
Support
Colt directs prospective customers to contact its team or talk to an expert about the service. · colt.net, 5 Oct 2026
Voice security
The service uses TLS and SRTP to encrypt signalling and voice media. · colt.net, 5 Oct 2026
What it does
SIP Trunking delivers voice communications over the internet and lets businesses make and receive calls through an IP PBX. · colt.net, 5 Oct 2026

Where Colt SIP Trunking stands on Freedom251

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