SIP Trunks

The Cost Effective Alternative to ISDN

SIP Trunking is the fastest-growing telephony service and MPS provides one of the UK’s leading SIP Trunk solutions.

Our SIP Trunks provide a highly flexible alternative to ISDN and are compatible with all the leading IP PBX brands in the UK market, giving you peace of mind that your PBX hardware works with the network service.

Compared to ISDN, SIP Trunks are cheaper on a per-channel basis and more flexible in terms of what telephone numbers you can have and the locations in which you can have them. In addition, they are quicker to install and offer a robust business continuity service that ensures your business never loses any calls.

Our service can support connections ranging from two channels for businesses with small PBXs, with no limit on the number of channels that can be supported for large enterprises and contact centres.

MPS provides SIP (Session Initiation Protocol) Trunk Lines in conjunction with a comprehensive range of access technologies including Ethernet (Fibre), Ethernet First Mile EFM (Copper), Generic Ethernet Access (GEA), Fibre to the Cabinet (FTTC) and other various ADSL services.

The Benefits of SIP Trunks

Flexibility with Phone Numbers

SIP Trunking enables you to move office and keep the same geographic number without any ongoing call-forwarding costs or those associated with producing new company stationery.

Business Continuity

If your office has to be temporarily relocated in an emergency, this can 
be achieved quickly and cost-effectively with SIP Trunking to keep your
business working.

Line Rationalisation

For businesses with multiple sites, 
SIP Trunking provides the opportunity for line rationalisation, while retaining full control of the numbers associated with your business.

Cost Savings

SIP Trunk rental is typically lower than ISDN. For all SIP Trunks provided before 31st March 2015, calls to UK fixed line and mobiles will be free of charge for the lifetime of the SIP Trunks in question (subject to contract and fair usage policy).

IP connectivity costs less than ISDN with lower call costs, free internal calls between extensions and offices and lower line rental costs for multi-sites. Also, no expensive call-forwarding costs are required should you relocate or need to divert calls in the event of a disaster.


SIP Trunking provides a phone service that will cope with any situation and give you business-grade resilience for your telephony. Whether you need to keep your business running in a disaster or emergency or you need to load balance your calls between sites during peak hours, SIP Trunking delivers.

For information and pricing for SIP Trunks call us on 0330 333 6400