Freedom report

One barScore 5.3

  • Free tierNo free tier on record
  • Open codeNo open-source code on record
  • Runs widely1 of 6 device platforms
  • DocumentedPlans, terms and facts published

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 is for

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 is good

  • 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

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.

Get started with Colt SIP Trunking

  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.

Questions about Colt SIP Trunking

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.

Colt SIP Trunking plans and pricing

All plans
Colt SIP Trunking Not published Pricing not shown; contact Colt colt.net · 5 Oct 2026

Compared on SIP trunking providers

Pricing model
hybrid
Number porting
Yes
Emergency calling
Yes
Encrypted signaling
Yes

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