SIP Line vs. SIP Trunk: What’s the Difference?

3 mins, 4 secs Read
Updated On December 15, 2023

Numerous organizations that offer local phone numbers and beyond-border services frequently ask if a method exists to upgrade and increase consumers without incurring astronomical monthly fees. On the other hand, SIP trunking and SIP lines are superb solutions. Let’s examine the distinction between the two to find out the one that best suits your needs.

Determining the Distinction Between a SIP Line and a SIP Trunk

SIP trunk

The phrases SIP line and SIP trunk often confuse certain users. Nevertheless, the two aspects work in tandem but are not interchangeable. Here, we define each term to help you understand them better.

Moreover, lines are referred to as SIP channels or SIP sessions. A SIP line is a component of a SIP trunk that enables the flow of info within two places. 

A SIP trunk is a collection of many SIP lines or channels. A SIP channel permits a device to accommodate an outbound and inbound call during a call. In all other terms, every call is routed through a single channel.

As a result, enterprises that require SIP lines would be more than content with a single SIP trunk. Nevertheless, the appropriate lines needed by your organization vary according to how many simultaneous calls are handled each day. Those providing SIP services provide a variety of plans, including:

  • Numerous channels
  • Channels can be added at any time, including session minutes
  • Minutes are limitless on a limited channel number
  • Various trunks are needed to link different workplaces to the same network.

What is a SIP Trunk (Secure Internet Protocol)?


The SIP trunk is the link between your company’s PBX and the Internet. To put it simply, it turns your legacy phone system into a virtual one.

As mentioned previously, a SIP trunk stores SIP channels and enables synchronous SIP calls. A SIP trunk may assist around one hundred SIP channels in VoIP phone systems. Multiple devices, teams, etc., can then be connected using them.

SIP trunking grants you and your team the utmost opportunity to create and receive calls by utilizing a connection with an Internet network, even in the absence of the common POTS connection. Thus, the technology is compatible with either conventional or VoIP systems. The SIP trunking protocol allows the distribution of video, voice, text, and other ways of telephone interaction.

The Benefits of SIP Trunking

Did you ask yourself why your trade should acquire and fully incorporate SIP trunking? The list you are about to read will certainly give you insights as to why SIP trunking is beneficial for businesses:

Unified Communications

SIP trunking enables you to handle almost every type of interaction process from a single interface.

Low Cost and Easy Setup

SIP trunks do not require sophisticated gear or software to operate. Secure connectivity to the Internet is more than sufficient.


If additional SIP lines are required, you may always add them to your SIP trunk. Again, no lengthy setup or setup procedure is necessary.

Is a SIP Line or SIP Trunk Required for Your Industry?

The choice is genuinely not binary. This is because SIP channels operate within the confines of a SIP trunk. The actual question is, how many channels do you require for your trade?

A SIP trunk can contain numerous SIP lines, allowing for the seamless transmission of multiple calls at the same time. In other words, if your organization has 250 SIP lines, it can simultaneously manage 250 calls. Every call consumes one SIP line.

The number of links in your trunk, and the amount you pay each month, play an active role in determining the price of SIP trunking. You can seek help from various departments to end up with a rough estimate. 

If your firm does not receive or make a high volume of calls each day, it may be appropriate to wish to have only a couple of team members or personnel on each SIP line. Moreover, you can add another line at a later date.

Final Words

There is no better time than now to integrate SIP Trunks with your telephone solution! Naturally, having the appropriate technological tools can either create or, on the bad side, break your trade. You will be required to conduct your own research to determine which vendor best fits your business’s needs and objectives. 

Then, inquire about prospective vendors’ experience meeting comparable demands from other customers. Contrast the plans they recommend and consider how each may benefit your organization and consumers.

Consider SIP trunking. Telnum can assist you in acquiring SIP trunks. Enhance your call-handling capabilities with advanced offers such as rerouting calls, recording calls, etc. Get in touch with us!

Author: Steffani Griffith