Spitfire SIP Trunks

Business VoIP & SIP

Spitfire is one of only a few interconnected operator and Internet service providers with its own SIP Trunk solution. Spitfire SIP Trunks are a genuine alternative to ISDN30e – we provide a managed service covering the IP connectivity, SIP Trunks and number management – exactly the same as with ISDN30e.

Benefits of Spitfire SIP Trunks:

• Up to 50% cheaper than BT ISDN30e – Rental and Connection.
• 1:1 Spitfire SIP SDSL managed router and Spitfire SIP trunks in one complete package.
• Porting of BT numbers as well as our own UK-wide number ranges.
• Proven interoperability with Avaya, Panasonic, PBXnSIP, Asterisk, IP Cortex, 3CX, Epygi, Trixbox, Vega Stream, Patton. CLICK HERE FOR APPROVED LIST OF SIP SYSTEMS
• Cheaper phone calls.

SIP Explained

While VoIP covers many different things, business ITSPs almost all use SIP – this is seen as a viable alternative to traditional ISDN. SIP Trunks refer to individual SIP sessions and are in effect sold like ISDN30e lines, so 10 SIP Trunks will allow you to have 10 simultaneous calls via your SIP provider.

SIP (Session Initiation Protocol) is the protocol that controls the call, this includes setting up the call and closing it down. The actual voice media uses another protocol RTP (Real Time Protocol), sent as normal IP packets. The IP traffic requires an internet connection to travel over and this is where the fun begins, as the required bandwidth is not normally provided by your ITSP. So just because you have ordered 10 SIP trunks doesn’t mean that you will have enough bandwidth to make 10 calls.

Spitfire are the only business ISP who are also an ITSP and an Interconnected operator. As well as offering SIP Trunks we have a leading hosted solution – Spitfire SIP Communicator™ – for more information on this please Click here.

Number Provision

We have numbers allocated on all UK dialing codes – allowing you to have the dialing code you require. In addition to this, any BT Retail number can be ported to our network – allowing your clients to retain their number when moving premises.

One of the great advantages of SIP is the ability to have numbers from any dialing code delivered to your office – regardless of it’s location.

Backup Options

SIP is ideal as a Disaster Recovery (DR) solution. Any number on the Spitfire network can be forwarded to any other location – as long as it is connected via a SIP Trunk or a normal telephone line. In the event of a failure of the main site, calls can be forwarded to home telephone numbers, mobile or other sites – or a combination of locations/numbers.

Spitfire are also able to provide a range of back up solutions for the underlying IP bearer, or combine a solution of SIP Trunks and normal ISDN30e lines.

Cost Comparison – Spitfire SIP trunks and BT Retail ISDN30e

For a customer with 10 ISDN30e lines and 100 DDI numbers, Spitfire SIP Trunks are 48% less expensive – with a wide range of back up options:

• One year BT Retail ISDN30e with 10 channels and 100 DDI quota plus CLIP - £190.80 per month.
• Spitfire SIPStream SDSL 2Mb 1:1with back-up ADSL circuit, 10 SIP trunks and 100 DDIs - £99 per month.
• Saving over £90 per month, with guaranteed ISDN30e equivalent quality.