0800 668 1717 nsf@adept-telecom.co.uk

Lot 3 and 5 – SIP – voice over a data connection


Standard Service Offer Service Description

Download our Standard Service Offer Description with customer conditions, implementation plans and Service Level Agreements

Standard Service Offer price card

Download our Standard Service Offer price card

Mandatory Service Offer Service Description

Download our Mandatory Service Offer Description with customer conditions, implementation plans and Service Level Agreements

Mandatory Service Offer price card

Download our Mandatory Service Offer price card

What are SIP trunks?

What are SIP trunks and why are they becoming so popular? Is it just because they are cheaper?

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Introduction to SIP trunks

For many years the only way to provide large buildings with telephony was to use ISDN30. Let’s be honest it works really well; but it is relatively expensive and is a bit inflexible.

The modern alternative is to use Voice over IP where your voice calls are carried over a data connection using a technology known as SIP (Session Internet Protocol). SIP trunks are cheaper than ISDN30 channels but you have to factor in the cost of the data connection as well. The biggest benefits come from improved functionality.

What do you mean by improved functionality?

Why is SIP more flexible than ISDN30?

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The benefits of SIP

  • Our SIP trunks are certified to work with Microsoft LYNC
  • SIP trunks are scalable (up and down) on a per channel basis (whereas with ISDN30 each bearer has a minimum of 8 channels and a maximum of 30). This is ideal if you have seasonal peaks and don’t want to pay for excess capacity all year round
  • Numbers become non-geographic so you can have a London phone number in Brighton if you want
  • If you move sites you can take your numbers with you, wherever you go (with ISDN30 you can only keep your numbers if your new site is connected to the same local telephone exchange as your old site)
  • A multi-site SIP installation means that you won’t need as many channels as you would with individual ISDN30 sites
  • You get better Business Continuity because calls can automatically fall-over to a 2nd site if needed
  • You can re-direct calls without paying expensive Remote Call Forwarding charges
  • Our SIP trunks work with almost all IP-PBX telephone systems
  • Full emergency services support comes as standard
  • OPTIONAL FREE CALLS – to UK numbers – with one of our calls and lines bundled offers

You sign the Order Form

You sign the Order Form and return it AdEPT Telecom plc.

Our Order Form is a MASTER SERVICES AGREEMENT that refers to all of the relevant Framework Terms and Conditions. The contract has co-terminus end dates for all products so that you don’t have to remember lot’s of contract end dates – it’s EASY – there is just one date for everything.

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How do AdEPT migrate the services?

You will be allocated a Premier Service manager who will be your single point of contact for every aspect of your service, including the initial migration. We’ve made it EASY – you only ever have one person to contact (and a named deputy and a special, shortened escalation chain).

The migration from ISDN30 to SIP needs careful project management and the longest part of the process is porting the numbers into SIP so that they become non-geographic. We will handle all of that for you.