Greatly improve your IP phone system with a simple SIP upgrade
SIP is the Session Initiation Protocol. In IP and traditional telephony, network engineers have always made a clear distinction between two different phases of a voice call. The first phase is “call setup,” and includes all of the details needed to get two telephones talking. Once the call has been set up, the phones enter a “data transfer” phase of the call using an entirely different family of protocols to actually move the voice packets between the two phones. In the world of VoIP, SIP is a call setup protocol that operates at the application layer.
SIP is a very flexible protocol that has great depth. It was designed to be a general-purpose way to set up real-time multimedia sessions between groups of participants. For example, in addition to simple telephone calls, SIP can also be used to set up video and audio multicast meetings, or instant messaging conferences. SIP also has great breadth as it does more than just handle call setup. The table below shows the five major functions within SIP from a VoIP point of view.
| Function | Description |
| User location and registration | End points (telephones) notify SIP proxies of their location; SIP determines which end points will participate in a call. |
| User availability | SIP is used by end points to determine whether they will “answer” a call. |
| User capabilities | SIP is used by end points to negotiate media capabilities, such as agreeing on a mutually supported voice codec. |
| Session setup | SIP tells the end point that its phone should be “ringing;” SIP is used to agree on session attributes used by the calling and called party. |
| Session management | SIP is used to transfer calls, terminate calls, and change call parameters in mid-session (such as adding a 3-way conference). |
Upgrading to SIP is a simple but effective way to improve your telephony system to allow a great range of features that will make communication amongst employees much easier and increase productivity in the workplace. Using all the functions of SIP you will be able to make internal calls at the press of a single button or see if people are currently busy on the phone already. It will also allow seamless call transfers and call conferencing, and the ability to see the name of the caller before you even pick up the handset and more.
Enquire now to learn more about how SIP can help your business flourish.
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