Colt SIP Trunking

Spec sheet

What it does

SIP Trunking delivers voice communications over the internet and lets businesses make and receive calls through an IP PBX.Read 5 Oct 2026 · colt.net

Integrations

It interoperates with Genesys Cloud, Cisco Webex, Talkdesk, Twilio Flex, Avaya Experience Platform, NICE CXone, Microsoft Teams and Zoom.Read 5 Oct 2026 · colt.net

Support

Colt directs prospective customers to contact its team or talk to an expert about the service.Read 5 Oct 2026 · colt.net

Headquarters

London, United KingdomRead 28 Sep 2026 · colt.net

Company background

Colt says it was founded in London over 30 years ago and is privately owned.Read 5 Oct 2026 · colt.net

Company security certifications

Colt lists ISO/IEC 27001:2022 for information security management and ISO/IEC 27701:2019 for privacy information management.Read 5 Oct 2026 · colt.net

Compatibility

Colt describes the service as compatible with leading IP PBXs and unified communications platforms.Read 5 Oct 2026 · colt.net

Cost savings

Colt says the service can reduce monthly costs by up to 50%.Read 5 Oct 2026 · colt.net

Intended customers

Colt positions SIP Trunking as a scalable voice solution for modern enterprises.Read 5 Oct 2026 · colt.net

Numbering

Customers can retain existing phone numbers or obtain new numbers in multiple countries, with number porting supported in most countries.Read 5 Oct 2026 · colt.net

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.Read 5 Oct 2026 · colt.net

Regulatory features

Colt lists emergency call routing, lawful compliance and data retention, and says emergency calling includes location-based routing to meet local regulations.Read 5 Oct 2026 · colt.net

Resilience

Colt states 99.999% uptime, supported by geo-redundant architecture and automatic failover.Read 5 Oct 2026 · colt.net

Voice security

The service uses TLS and SRTP to encrypt signalling and voice media.Read 5 Oct 2026 · colt.net

Plans and prices

Every Colt SIP Trunking plan and price →

Where Specifiction places it

• SIP Trunking Providers#17 of 277.1