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Home > Products > Voice Telecommunications > SIP Trunking and Business VoIP

SIP Trunking and Business VoIP

SIP Trunking and Hosted PBX


Spitfire is one of the UKs leading SIP trunking and business VoIP specialists, providing all of the services you need for when you are ready to move your telephone communications to IP and a next generation network.

Switch from traditional telephone lines to SIP trunks or Hosted PBX services and you can enjoy number flexibility, improved business continuity and scalability, whilst benefitting from significant cost savings.

If you are opening a new office or moving premises, looking to reduce costs or are worried about disaster recovery then speak to Spitfire about SIP services.  With BT Group aiming to shut down their ISDN network by 2025, it’s time for you to plan your move to SIP.

Click on the product info buttons to the right for more information on SIP Trunking or Hosted Telephony solutions.

Need more information about how business SIP Trunks actually works then visit our ‘Business SIP Explained’ page using the button or alternatively enquire now and one of the team will be happy to help.

If you are moving premises or opening a new office, looking to reduce costs or are worried about disaster recovery, you need to speak to us about SIP and Business VoIP. More than 90% of the main office telephone line installations we make are now based on SIP services – and we’ve been using a VoIP network in our own offices for over eight years.


Over 80% of ISDN lines will have moved to SIP by 2019, and with BT Group aiming to move all ISDN customers to IP by 2025, it’s time for you to plan your move.


If you would prefer to continue to use your existing phone system then we have a range of SIP gateways which can easily enable your existing platform, whilst still offering a great saving over existing ISDN telephone line charges.

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