SIP Trunking is the method of delivering the voice signal from a VoIP service provider’s servers to a customer’s IP PBX using Session Initiation Protocol (SIP) communication protocol. A SIP Trunk is commonly known as a channel (concurrent call or phone line) that allows a PBX to receive and send calls.
How SIP Trunking works
SIP Trunks are the corresponding or replacement VoIP services for traditional PRIs or analog circuits. As such, the SIP Trunk will represent the connection (using the Internet) between your internal network (PBX) and your SIP services provider, who will take your calls and terminate them to their destinations; in the same way, the incoming calls will reach the SIP services provider, who will send them to your PBX via the SIP Trunk.
Preparing for SIP Trunking deployment (SIP Trunking requirements? – subtitle to be determined based on search volumes)
Once you’ve done your research and decided that SIP Trunking is the right business phone service for your business, the next step is to ensure that your business is prepared to deploy such a technology.
An IP PBX – The IP PBX, sometimes referred to as a VoIP PBX or SIP PBX, will be the system that will allow you to create internal extensions for your users and connect to the outside networks using your SIP Trunks. Most popular choices include open source PBX systems such as Asterisk (with an array of interfaces like Freepbx, Elastix, Trixbox, FusionPBX) and Freeswitch, and proprietary software such as 3CX or Avaya. You can choose to install your PBX on your own servers, or opt for a PBX Hosting solution.
Static IP – Although the connection between your PBX and your SIP provider can be also done using authentication and a dynamic IP address, SIP Trunking providers recommend IP-to-IP connection, for an enhanced security.
IT resources – Whether you intend to switch from a traditional PBX to an IP PBX, or you are deploying a SIP Trunk for the first time, you will need a telecom engineer to install and configure your PBX. Also, keep in mind that the skill set required for the configuration and maintenance of an IP PBX are slightly different than the ones required for a traditional PBX
Internet – Running your voice services over the Internet will put some additional pressure on your connection, so you will need to ensure that your LAN (Local Area Network) is prepared to serve your vice needs without issues. Bandwidth is usually the first aspect to consider. A minimum of 100 kbps is recommended for each concurrent call, however, be reminded that other applications on your network will require bandwidth; a speed of 1 Mbps (upload and download) for each concurrent call should be enough for both your voice and other data. To prevent any quality issues, it is recommended that your network equipment is configured to allow Quality of Service (QoS), which will prioritize voice packets on the network.
SIP Trunking is a service that is growing every year in popularity; businesses love it because it increases their flexibility, level of customization and protects their budget. A proper understanding and planning of the deployment of SIP services will make the transition as seamless as possible and will enhance the user experience, as well as streamline any business’ activity.