Enterprise Voice & SIP Trunks

Enterprise Voice & SIP Trunks

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Interoute One is a powerful yet simple voice proposition for Enterprise customers.

SIP trunks are delivered across Interoute’s resilient high capacity digital platform providing inbound numbers in over 50 countries and worldwide outbound voice calling.

Our business quality Voice over IP (VoIP) solution is easily integrated into any existing voice infrastructure.   



Activate new or migrate your existing geographic numbers in over 50 countries.  Consolidate your legacy supplier relationships.


SIP trunk provisioning is quick therefore no long delivery schedule.


Utilising Interoute’s extensive digital platform footprint excellent quality is maintained delivering low latency calls terminated locally.


No matter what the mix of telephony equipment you have you can easily incorporate your legacy equipment.  We also offer free trials to demonstrate functionality. 


Calls between SIP trunk connected offices are free no matter where they are in the world.


As a Microsoft global Skype for Business partner Interoute supports its latest communication server offering.

Why Interoute?

Interoute One is designed for customers who are looking to reduce their costs without compromising on quality or security.

No new hardware is needed with fast and easy integration across multiple geographies allowing for an easy migration path for customers with legacy equipment

Keeping costs down is easy with no trunk set-up charges and free office-to-office calling.

Flexible connectivity - connection to our voice solution can be made via public internet or private connectivity or even TDM

Easy migration.  Whether migrating  from legacy PBX’s or Microsoft Skype for Business moving to Interoute One is simple and we can work with you on either a staged rollout or full cut over.

Simple billing.  With no per minute charges for inbound DDI calling and straight forward outbound calling rates from a simple international rate card managing budget is easy.

Worldwide coverage.  Voice network presence across the globe, DDI access in over 50 countries and national and international outbound calling worldwide.

Quality Network.  Acting as single supplier across our global digital platform offers end-to-end management and quality control.

We require a provider as forward thinking as us, which is why we work with Interoute.
Interoute gives us flexibility and helps us reduce costs.
MAGNUS NILSSON – Operations Manager, Cloetta

Extra Information

Related Services

Skype for Business

Our Skype for Business service (formerly Microsoft Lync) delivers a feature-rich, fully scalable UCaaS solution

Conferencing & Collaboration

Able to integrate with all legacy systems, our conferencing platform keeps your staff connected from anywhere, at anytime, from any device

Global Interconnect Services

Delivering a Virtual Voice Network (VVN) on a global scale via a self-service management portal

MPLS VPN & Hybrid WANs

Delivering resilient, fully managed hybrid WANs to enterprises across the globe, all with industry leading SLAs

Technical Specs

SIP Trunks
Our SIP trunks provide a VoIP connection to Interoute’s voice network that enables worldwide outbound calling at rates communicated via an agreed rate card.  (To receive a list of our current rates please email us.)  Voice calls received from any Interoute provided DDIs are also routed to this SIP trunk.
SIP trunks can be delivered via Public internet or Private connectivity.  The trunks are  compatible with any SIP enabled  PBX or SBC  including Microsoft Skype for Business 2015 and Microsoft Lync 2013 and 2010.
Customers wanting to benefit from an automatic call forward, activated on a connectivity failure to a pre-defined telephone number can purchase our Assured Inbound service.  The telephone number is pre-configured at the time of order.
If customers wish to share capacity across multiple trunks, trunks may be placed in a load-sharing group.  This will allow for better bandwidth capacity management and potential reduced trunk charges as trunks do not have to be individually sized for peak usage, only the group needs to be sized for peak usage.
International geographic DDIs
We can provide customers with one or more inbound geographical telephone number known as a DDI (Direct Dial-In).  We can offer numbers in over 50 countries. The ability to port numbers from the existing provider is also possible but this is country specific.
Interoute’s DDIs provide a customer with full inbound call delivery from the PSTN.  DDIs may be ordered with high simultaneous call capacity for conferencing and contact centre purposes.  
Interoute supports Emergency Service termination for Interoute DDIs activated with valid subscriber location details.  In some countries Interoute can only support Emergency Service calling using Customer Premises Equipment (CPE) provided by Interoute.
SIP trunk reporting, showing simultaneous call utilization in graphical and tabular format, DDI reporting showing per DDI maximum simultaneous calls and standard voice minutes and quality reporting is available via our My Services customer portal.


'How to' Videos

For help on how to use Interoute Enteprise Voice solutions, please use the links below to view our series of 'How to' videos:

Keep connected

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Sales: +44 20 7025 9100

Channel Partner Sales: +44 115 983 6200

Support: +800 4683 7681