SIP trunking bundles various telephone lines like branches held together by a single trunk. Originally, trunks were used to connect a telephone system (PBX, Private Branch Exchange) to the telephone provider's network via the Public Switched Telephone Network (PSTN). SIP trunking does almost the same thing, except that in this case the PBX is connected to the provider network via the internet instead of the PSTN.
SIP trunking allows companies to upgrade their existing PBX infrastructure to use VoIP functionalities. This is all the more interesting because major changes are soon coming to the telecommunications market that will make it inevitable for many companies to switch to VoIP telephony.
More precisely, ISDN (Integrated Services Digital Network), the standard that enables telephone calls over the PSTN, will soon be switched off in favour of VoIP. This means that many companies whose PBX infrastructure is based on analogue or ISDN technology will have to switch to VoIP systems.
In these cases, SIP trunking is recommended as a perfect stepping stone from the ISDN to the VoIP world. Specifically, it allows companies to maintain their existing infrastructure and still benefit from all the advantages that VoIP telephony has to offer.
SIP trunking allows an existing PBX hardware to be converted to VoIP. How this works in detail depends on your PBX. There are 3 common PBX models that can be converted with SIP. These are:
As the latest generation of PBXs, IP PBXs have inherent interfaces that allow direct connection to the SIP trunk, using straightforward configuration tools. This makes it quick and easy to connect IP PBX systems with VoIP systems, such as the NFON Cloud Telephone System.
NFON works with the leading IP PBX manufacturers and certifies the relevant equipment to ensure interoperability and ease of set-up. However, some devices may require additional equipment to connect to NFON, depending on the manufacturer.
Yes, SIP trunking is secure, but only if the responsible provider takes the necessary security measures. NFON, for example, offers a SIP trunk that is hosted in secure, geo-redundant data centres in Germany. Our servers are subject to EU regulations regarding electronic communications and meet the highest requirements for data security and fail-safety etc.
In the event of a technical problem, such as a power failure, NFON SIP trunk is still available. NFON data centres are certified according to ISO/IEC 27001 - Information Security Management. The voice quality of the NFON Cloud Telephone System has also been assessed and certified by TÜV Saarland, a globally recognised German certification body.
There are basically two ways to provide SIP trunking - the one that suits you depends on your existing infrastructure and your requirements. The following two options describe the optional path for any business:
With this option you can benefit from lower call charges and at the same time making your PBX fit for the future despite the switch-off of ISDN. However, the costs for hosting and operating the in-house PBX remain. In addition, not all VoIP functionalities provided by the provider can be used.
With this option you can reduce your call charges and still use a whole range of VoIP functionalities. However, you will still need to run your IP-PBX in-house and may need to employ specialist staff to do this. You may also need to invest in additional hardware to add SIP functionality to your IP-PBX.
For more information on SIP trunking and how NFON can help you make your existing infrastructure VoIP-ready or switch to a cloud-based PBX, see the following articles:
Or discover NFON and take advantage of our 30-day free trial package, where you can test all the features and find out what suits your business!