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An Introduction to SIP Trunks

More & more of our customers are making the switch to IP based telephony either through the use of a fully hosted VOIP telephone system or an on-premise telephone system that utilises the broadband for making & receiving calls using what's know as 'SIP Trunks.


What Is SIP?

To understand “SIP Trunk”, you first need understand "SIP".

Over the past few years, the telecommunications industry has standardized on SIP as the protocol of choice for phone calls on the data network.  SIP, which stands for “Session Initiation Protocol”, is the technology used for establishing a voice communication session on a data network (for example over the Internet). A SIP “session” might be a regular VoIP phone call between two participants or a multi-party conference call.


What Is SIP Trunking?

Now that you better understand SIP, we can move on to the term “SIP Trunk”. A SIP Trunk provides the same service you get from a traditional analogue phone line. The difference is, instead of being a physical wire, a SIP Trunk is a “virtual” phone line that uses your data network to connect your phone system back to their network.


Why Convert to SIP Trunking?

Because there are no physical lines that need to be maintained with a SIP Trunk, and because of the lower price structure of VoIP, a SIP Trunk is considerably less expensive than traditional telephone service.


How Many SIP Trunks Do You Need?

The number of SIP Trunks is determined by a few factors. First, how many concurrent calls does your business need? As a typical rule of thumb, you'll need approximately one SIP trunk for each 2-3 users.

Secondly, your Internet connection is an important consideration. SIP Trunks consume bandwidth. Depending upon the quantity of phone calls and need for data bandwidth, you may have to expand your data circuit.


How Much Will SIP Trunking Cost Me?

Each SIP channel costs just £9.00 per month or £14.00 per month including unlimited UK landline & mobile calls which means that SIP trunks can be very cost effective when compared with traditional analogue and ISDN2 lines.


For more information regarding SIP Trunks please contact your Account Manager or of course pay us a visit at our walk-in office on Commercial Road in Hereford!