Line Calls and SIP Trunks

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Why Should Your Business Use a SIP Trunk?

If your perfectly happy with your traditional business phone system but not so happy with the call charges, SIP trunking could be the solution for you. By using SIP trunking, your organisation can make VoIP calls using the existing phone system which means you receive all the benefits of a VoIP phone system – such as significantly cheaper call charges, better reliability, more flexibility and easier access for remote working – without the disruption of changing or removing your on-premises PBX.

Business continuity is a particular feature of this system as it is more reliable than a traditional phone system alone, provides greater flexibility for off-site working and makes disaster recovery easier and faster. Not only that, as it works with existing phone systems and is efficient to install, there is very little downtime during the switch over so business disruption is kept to a minimum.

Future downtime is also minimised with this system as the entire system is routed through a single line so there is no need to go to the expense and disruption of adding extra lines or installing new systems if extra capacity or features are needed. Integrating the voice and data networks in this way makes changes easier and faster as well as eliminating the need for separate line rental charges.

SIP trunking looks to the future in another way too. BT have announced that they are switching off the ISDN network in 2025 and this provides an excellent alternative for businesses.

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Supported PBX Systems

SIP trunking can be used with the vast majority of modern PBX systems. For systems more than a year or so old, you may need a SIP-ISDN Gateway. This is essentially a small box that provides a link between the phone system and the SIP trunk. From 2020, phone systems that use ISDN lines will no longer be available.

What are SIP Trunks?

SIP stands for session initiation protocol and this is a communications protocol used to control multimedia communication session elements such as establishment and termination of the call. The ‘trunk’ part refers to a dedicated physical line that connects the telephone system to the switching equipment. Essentially, the SIP trunk is a way of translating the data from the traditional phone system so it can be transmitted via the IP network.

SIP trunks can be installed along with a dedicated line, a dedicated line that carries other IP traffic along with the VoIP or it can use a public internet connection through broadband. The huge advantage to having a line dedicated entirely to carrying the phone signal is that it can’t be slowed down by other IP traffic so is very fast and high quality but is also very secure. If your company does not have particularly high traffic, sharing a dedicated line with IP traffic shouldn’t be a problem. Using public internet is the least reliable method but also the least expensive.

Whichever connection method is most appropriate to your business, if you have an on-premises PBX which you’d like to keep but you want all the benefits of a VoIP phone system, SIP trunking is the perfect solution and will continue to work after BT turn off the ISDN network.

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