Session Initiation Protocol (SIP), is a Voice over IP (VoIP) technology. It enables calls to be made over an Internet connection. The SIP Trunks link the PBX to the public telephone network.

SIP Trunks
Savings Save up tp 50% on line rentals & 25% on calls. More costly.
Flexibility You’re in control. Add lines, take them away, split calls – it’s up to you. Not Flexible.
Control Choose how & where you want calls delivered. Make changes instantly. Changes takes months. At the mercy of suppliers
Future Well mapped out & ready for voice/data convergence. Going nowhere fast.
Disaster Recovery Well mapped out & ready for voice/data convergence. Hope nothing bad happens.

Benefits of SIP Trunks

Although there are numerous benefits to SIP, one of the primary drivers for most businesses is the cost savings that can be achieved. As SIP trunks are “virtual” phone lines, there are numerous ways to package SIP trunks to end users.

Typically, SIP trunks will carry a very low line rental and calls will then be charged on top or you will be offered a slightly higher (but still cheaper than legacy analogue and ISDN) line rental which includes the vast majority of your calls. Either way, the savings to be gained are generally very impressive. Savings are proportionate to the number of lines you have and the volume of calls you make.

As calls over SIP is simply the movement of data packets, any calls that are chargeable (depending on your package) tend to be a lot cheaper than calls over legacy networks.

The example below shows the cost savings that can be made:

A health centre had 18 x ISDN30 channels, 80 x ddi numbers and made a lot of calls to mobiles. Their average bill was in excess of £800 plus VAT per month. Their recent move to SIP has reduced their average monthly bill to £320 plus VAT

Assured SIP is a direct connection into the SIP network. This eliminates the danger of different ISPs losing traffic. The connection we use is put in place for your voice traffic only so it is not slowed by other data traffic passing through.

As the router is set specifically for your SIP trunks and is configured to only pass traffic between your premises and the SIP network, we are able to offer far more secure connections which reduce the risks of telephone fraud significantly.

Each Assured connection is installed, tested and certified. This gives our customers the peace of mind that the move to SIP will not give them any loss of voice quality.

Assured services come in various sizes (5,10 and 15). The numbers simply describe how many SIP trunks we are able to deliver over that connection. Where fibre is available, we are able to offer up to 30 x Assured SIP trunks on a single connection.

Assured SIP services are now available to most of the UK. A current phone number is all we need to be able to tell you what Assured SIP services are available to you.

Local Presence

SIP allows you to get local virtual numbers in places where you are not physically located therefore allowing your business to create a virtual presence in different locations.

Disaster recovery

Your business can support its disaster recovery strategy with SIP Trunking as calls can be redirected to any location or device, preventing downtime to your business.


Your business can expand quickly as additional call capacity can be added quickly.

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Testimonials We have always found APR Telecoms to be reliable and pleasant to deal with. From sales to maintenance, they provide a first class service. They helped us during a major site move/refurbishment project and they were brilliant. They met our tight time-scales and ensured that our new system was ready and up and running for our moving in date. We would never look to use anyone else for our telephony requirements.

David Holmes
Redco Ltd

Testimonials At ML we are an extremely customer focused company with a real emphasis on personal and professional communication with our clients, a value understood and shared by APR Telecoms. These shared sets of values and the fantastic service that we receive made APR Telecoms the natural choice when we came to selecting a business communications company to work with. We are delighted with our decision to work with APR Telecoms and would have no hesitation in recommending them to others.

Simon Lister
ML Financial Associates