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What is SIP Trunking?

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This article is intended to help explain SIP trunking while taking into account it’s benefits from our team of leading SIP Trunking experts and providers here at Engin.

SIP trunking is a relatively new technology that is revolutionising VoIP business telephony. Unlike ISDN, which involves traversing the costly and often complicated Publicly Switched Telephone Network (PTSN), a SIP (Session Initiation Protocol) trunk connects your business directly to your ITSP (Internet Telephony Service Provider). Although fairly straightforward, the technicality of the process is what has brought rise to clever SIP Trunking tutorials and literature such as ‘SIP Trunking for Dummies’.

What SIP Trunking basically means and allows is the ability for you to extend your VoIP telephony beyond your organisation’s firewall, without the need for an IP-PSTN gateway which allows a SIP Trunk to be a key driver in cutting the bottom line of the costs of production in business.

A SIP trunk can be less expensive and much easier to initiate, operate, maintain and upgrade and it can give your business a quick return on investment from the savings you will immediately begin to realise, particularly on long distance phone calls.

A SIP trunk is a virtual connection, which can be made over a line dedicated to voice only traffic, a line that carries both voice and other traffic, or over the Internet on a VPN (Virtual Private Network).
If the connection is via a dedicated or ‘leased’ fibre optic line, it will be the most desirable option for business. It can carry the greatest amount of simultaneous traffic and is the most secure and reliable of connections, but the downside is it is also often the most expensive.

SIP trunking offers a number of benefits to business. These include the potential for:

  •         Cost savings on phone calls, particularly international phone calls.
  • Additional features as standard, such as instant messaging, conference calling and user ID information.
  • The option of PBX hosting, which can significantly reduce your maintenance and administration costs.
  • The ability to purchase as much or as little bandwidth as you need and in smaller and much cheaper increments.
  • A direct number for each phone line, with line rental charged per block, rather than per line.
  • The ability to add extra lines in single increments as your business expands and grows.
  • Unlimited phone calls between dedicated numbers.

In short, SIP trunking offers business the advantages of converged communications and for potential for substantial cost savings and its implementation should therefore be number one on every SMEs communication upgrade agenda.

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