Telephone Trunk Lines: What is a SIP Trunk?

You may have heard of the new telephone trunk lines that are taking over the work places and wonder what they are all about. There is a lot of jargon that is used when talking about this and here we will educate you on one of those complex terms you hear; telephone trunk lines: what is a SIP trunk?

The definition

In order to understand what a SIP trunk is, it is important to understand the meaning of SIP. SIP stands for Session Initiation Protocol. This is a communication protocol that signals and controls the communication sessions of voice and video calls in internet telephony. SIP is now being used in many companies to provide telephone communication among different people in the premise using the internet. It is now preferred over traditional telephone lines.

In order to use SIP, the company needs to have a SIP-based PBX (Private Branch Exchange) and communication facilities that allow unified communication. These communications will allow desktop sharing, voice and video calls and web conferencing among others.

An SIP trunk is a virtual telephone line trunk that is delivered over IP using SIP protocol. Using this protocol VoIP providers connect channels to the company’s PBX and then phone numbers are linked to the SIP trunk. It is like a tree with one trunk (the SIP trunk) and many branches(the telephones) except the connections are invisible. The SIP trunk is installed(virtually) over the internet connection there is in the premise so there are no additional wires added when it is installed.

A clearer picture of what a Trunk in SIP is

In telecommunication there are two types of domains. The first is the private domain which is the part of the network connected to the company’s PBX. The other is the public domain which is the part of network that allow saccess to PLMN (Public Land Mobile Network) or PSTN (Public Switched Telephone Network). The private and public domains are connected through the SIP trunk. This interconnection is made possible through internet protocols. There are rules and regulations set that determine what action the SIP trunk takes when a unified communication request is made.

What are some benefits of SIP Trunking?

  • SIP trunking has many benefits over the traditional phone line. These include:
  • Cheap installation because there is no need to purchase wires and rent DID.
  • Save on your monthly phone bill with lower charges on calls made.
  • With SIP trunks there will be no need for VoIP gateways because all calls are via IP and hence eliminating the need to
  • Extending the communication channels is easier with SIP trunking than with other protocols. It will also cost you less to increase the number of customer care lines which means happier customers.

Who can you trust to install telephone trunk lines?

Now that you know the answer to; Telephone trunk lines: what is a SIP Trunk and the benefits you stand to gain you must be wondering who you should talk to about its installation. When making this important decision here are the factors to consider.

The SIP should have a secure network and be protected from unauthorized access by the latest encryption. The provider should be able to port your current numbers so you can use the same even on the new system. This is very important in communicating with previously served clients. The cost should be affordable and save you money. However, avoid buying services that are too cheap as these may not be as reliable as you want.