SIP Trunking

Connect your phone system to public telephony and prepare its migration.

Session Initiation Protocol (SIP) supports calls over IP. For compatible phone systems, review numbers, countries and simultaneous calls.

Numbering, emergency services, portability, codecs and features vary by country and platform.

Let’s talk

Office phone and headset for business communications.

How it works

Modernise telephony while retaining control of numbers, quality and continuity.

Customer PBX

SBC / SIP trunk

Signalling and audio

Telephone network

Establish the call and carry the voice

The PBX or compatible platform exchanges SIP signalling with Colt at the agreed demarcation. The session border controller (SBC) governs interconnection; audio uses media flows that also need a working path.

A ringing call with no sound may have working signalling but blocked audio. Validate addresses, ports, NAT, codecs and SBC ownership.

Customer PBX

SBC / SIP trunk

Measure voice quality

Telephone network

Quality and concurrency

Size simultaneous calls, not just numbers. Analyse loss, latency and jitter, distinguishing channel-limit rejection from audio degradation.

QoS needs consistent treatment across controlled segments. LAN priority does not guarantee quality across arbitrary Internet paths.

Customer PBX

SBC / SIP trunk

Alternative destination

Telephone network

Keep receiving calls

Design alternatives for access, SBC or PBX failure: trunk routing, a second destination or inbound diversion according to available options. Test detection and restoration.

Restoring new calls does not guarantee preserving ongoing calls. The pilot covers inbound, outbound, authorised emergency-call procedures and normal restoration.

Illustrative case: from situation to decision

Situation: A phone system must migrate while retaining numbers eligible for porting.
Option: Plan countries, concurrent channels and porting phases with the compatible platform.
Check: Test inbound and outbound calls, two-way audio and recovery before each phase.

Validate numbering, emergency calling, porting, codecs and resilience by country and platform.

Decisions for your project

Countries and numbers: Porting, caller ID, location and emergency-calling obligations.
Interconnection: PBX/SBC, codecs, agreed encryption, channels and media.
Continuity: Access, alternative destinations and failure/restoration tests.

From design to operation

Inventory numbers and PBXs; test a pilot block before phased number porting.

Complements, alternatives and variants

Colt IP AccessComplementSupports voice transport according to access design.Intelligent NumbersComplementAdds routing rules for inbound calls.

Product sources

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What happens next?

Understand the context
What’s changing, where your teams work and what cannot fail. Still defining the brief? We can help structure it.
Design the options
Bring needs, Colt capabilities and technical criteria together. Compare alternatives and explain dependencies and limits.
Validate before committing
Coverage, feasibility, responsibilities and terms. A commercial proposal is developed with the relevant specialists.

ColtPlatinum guides the project and coordinates commercial discussions and follow-up. Colt validates feasibility, enters into the service contract, and provisions, installs and delivers the services.

Availability, coverage, capabilities, SLAs and timelines are subject to technical validation and contract. No diagram is a service guarantee.