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VoIP is the technology that converts your voice into a digital signal, allowing you to make a call directly from a computer, a VoIP phone, or other data-driven devices. You may also hear it referred to as IP telephony, internet telephony, broadband telephony, or broadband phone service.

VoIP generally means services such as Skype, but business VoIP users require the same quality as ISDN30e.

ISDN30e quality is delivered by ITSPs (Internet Telephony Service Providers, such as Spitfire) who deliver VoIP services using SIP – Session Initiation Protocol.

SIP is the protocol that controls the call, setting up the call and closing it down. The actual voice media uses another protocol, RTP (Real Time Protocol), sent as normal IP data packets, so a conversation is broken down into thousands or tens of thousands of tiny IP data packets, each one carrying a fraction of a seconds worth of conversation.

The key to SIP call quality is that every single IP data packet, with its millisecond’s worth of conversation, arrives in the correct order and without any delay, so every packet arrives after the previous one, in a constant stream. To ensure this happens 100% of the time you need an Internet connection that has guarantees covering both up time/availability and quality, in terms of packet loss (packets never arrive), jitter (varying time delay between packets) and delay (how long each packet takes to be delivered).

SIP trunking is a form of telephony that connects your business to the Public Telephone Network (PSTN) using a data circuit and Voice over IP (VoIP), rather than traditional BT analogue or ISDN lines.

If deployed correctly it is therefore a direct replacement for ISDN but with many additional benefits, or alternatively can be used as a useful backup technology to an existing ISDN service.

More and more businesses are moving away from running their voice calls over traditional ISDN telephone lines and making the transition to SIP trunking, taking advantage of the increased flexibility, resilience and cost savings on offer.

This trend will continue as ISDN becomes a legacy product, with SIP trunking now at the forefront of voice solutions.

In order to make or receive a call, your handset or softphone on site needs to connect to the caller via the PSTN (Public Switched Telephone Network).  Spitfire has a unique place in the market as we offer a fully managed end-to-end solution to support the full journey of a call.

Your hosted phone system is located in one of Spitfire’s secure data node facilities. From here it connects to the Spitfire SIP network; a network isolated from the public Internet and purely dedicated to SIP voice traffic, with a direct interconnect to the PSTN.

Your office users connect to the system using a Spitfire voice approved data connection to assure business voice quality and provide a completely secure connected environment.  The call will be delivered to the handset or softphone to complete the route from the PSTN to your users.

Any remote users or branch offices may also connect to the hosted phone system using existing Internet connections, however please discuss these with us so that we can advise on how to assure call quality.

All handsets are pre-configured by our engineers and are set up on a ‘plug-and-play’ basis to make self-installation extremely straight forward.  

Spitfire are an award winning service provider with over a decade of experience providing SIP solutions, and we have won back to back awards for the Best Hosted PBX at the Comms National Awards.

When using a Spitfire voice approved Ethernet or Broadband circuit, call quality from the handset to the PSTN network can be ensured at all times, making Spitfire one of the only providers to offer a fully owned end-to-end solution with quality guarantees.

At Spitfire we realised that this is a complex concept to understand without detailed knowledge of carrier networks so we developed the CLEAR methodology to break down the complexities into easy to understand components.

Following the CLEAR methodology, Spitfire design VoIP services to ensure consistent voice quality, using our voice designated network, voice approved circuits and Quality of Service (QoS) mechanisms.