7 Important Things to Know about SIP (Session Initiation Protocol)

Session Initiation Protocol (SIP) is a protocol system mainly used in VoIP communications. SIP gives users the benefits of making voice and video calls with most of these calls being made with no charges. Today, communication is one of the most important ways by which the world is still connected. Travelling and schooling to other parts of the world by friends and family has led to the importance of making calls. This is why SIP has come to be very important.

SIP allows users to make maximum use of voice over IP in order to have the best internet calls. Instead of using your mobile phone and paying normal and expensive international call charges, using SIP allows you to have a great communication time and also have the very best price when making such calls. Some things to know about SIP include;

  • SIP Termination is used in setting up networks in companies to control their internal and also external communication systems and it also very simple to understand.
  • Calls for both audio and video that are made between two or three SIP users are totally free
  • Calls made with SIP to other protocol systems are very cheap.
  • SIP calls come with no hidden charges or law that restricts users in any way no matter where you are.
  • To communicate using SIP, you will need to sign up for a SIP account.
  • Installing a SIP client on your soft phone or computer will help ensure that all features work well.
  • Make sure you talk to your friends that you want to talk to through SIP to also have an account and do not forget to have earpieces, webcams, etc for effective communication.

Just imagine the excitement that one feels when they are able to do business from one country to the other without having to worry about call charges and also see the face of their business partners in foreign countries.

What does an SIP provider do?

VoIP (Free VoIP Calls) has become most popular among business, users at home and community of tech at large. Each organization defines it in different ways. “Sip Provider” is one of the phrases, which is not clearly defined. The VoIP industry is so expanded that anyone using or providing voice calls through internet are also called as Sips Providers. But let’s look at various services offered by sip providers:

Providing Sip address

Unlike email service, anyone giving Sip address is called as Sip provider. The involvement of sip providers is bit complex as compared with email. The messages in email are received as asynchronously, that means you’re not required to be online to receive a message from someone. But to complete a voice or video calls you need to be in system when the call appears. So it means that you require software in your computer so as to communicate with sip providers, to let them know you’re available. Sip clients are similar to email clients in nature. Google has integrated the software with Gmail in the browser, even though Sip address is not provided by Google Voice.

Services forwarded to a Sip Address

Having a sip address is being a major problem is that unless everyone holds, there is no point in retaining it.  For instance you are only user having email ID, whereas others are still communicating with letters. But innovative providers have found new way to it. In the above instance if you are given a token address and for which any correspondence specified to that address will be mailed to your email ID. It’s like having a physical address were you can still utilize your email ID.

In the same manner some companies offer you Free Sip, like IPKall offer free US phone number. In such case any calls made from that number are forwarded to sip address which ever you retain it. Thus you can make free calls through internet by any phone. This is the magic of Sip Protocol.

What Is SIP? ,The definition of Sip provider will be changing but the flexibility in technology is a key to success in providing unique services.

SIP Port

The Port used by Sips is UDP 5060 for signaling and media are sent through RTP.  The location of setting can be viewed at Admin>Setting>Ports. In this portion you can find the details of Sip Protocol. Sip works on TCP, UDP or TLS. UDP and TCP are considered unsecure, since sip packets are sent unencrypted. TLS is most secured sip communication, since it encrypts just as HTTP. But default ports used are RCF3261 is 5060 for sip and for Sips it is 5061.

The most commonly used port is 5060 which is more associated with sip. What Is SIP? The protocol of communication supports the signaling protocol, which are basically used for supporting of session involved in multimedia communication like voice calls or video (opt for Free VoIP Calls). These are possible only through high speed broadband connection.

The port 5060 is more feasible execution of transport of multimedia streaming, online gaming, video conferencing, instant message. Various media streams are catered through this port, like the protocol working on this port will utilize creation, modification and termination of session for unicast or multicast.

Port 5060 server is like a gateway in deleting, adding or inviting the participants for streaming of media. There is an involvement in changing of address or port. The main person behind the implementation of original design of Sip is Henning Schulzrinne from Columbia in year 1996.

Using of Sip ports over UDP, TCP or TLS are as follows:-

  1. Sip UDP port: If you are utilizing SIP over UDP the following fields has be set first, default port UDP 5060 and multi port are also permitted like 5060, 5064.
  2. SIP TCP Port: If you’re utilizing Sip over TCP the following default has to be set TCP is 5060.
  3. SIP TLS Port: If you’re utilizing Sip over TLS the following default has to be set TLS is 5061.

Spanning Tree Protocol (STP)

STP is usage on switches to avoid loops on SIP network. The implementation of this process is through spanning tree algorithm to disable the unwanted blocks or links in port which causes loops. Duplicate frames and Loops can root severe effects on the network. Most LANs are designed to cater redundancy; if a link fails the other one can overtake it, by forwarding the frames transversely through LAN.

The switches on the port can detect MAC address of PC or host. By sending the message to another switch in the network is to notify its knowledge in getting into PC. The problem arises when the other host or PC discovers that switches are similar to other PC’s MAC address. Mean while all the messages will start flooding in the network and the switches will not know how to discover PC or host and thus formation of Loop.

Spanning Tree Protocol ensures one logical path for all destinations in network by blocking of redundant path which can cause Loop. When the loops are detected by the switches it immediately blocks the one or more path in forming of loops.

To stop the formation of Loop, one switch is chosen by network that is Root Bridge and  Root port are selected by other switches , later which  Designated port  are selected by segments by closing down all the ports.

Cisco has default STP switches therefore no configurations required. STP regularly monitors the failure in network, any topology network changes or switch port.


What are STP Port States? (With STP Port States figure)

The STP has been long and attached to LAN (Local Area Network) in multiple ambiances. It is very much need in environments, where 2 layer of multiple path subsist between variety of layers of two devices within the Local Area Network. All the ports which are connected to the device pass through the number of unlike states (Port States) that allocates STP sufficient time to establish the status in network and at the last stage port has to be fixed.

The main purpose for STP operation is to stop switches loop all over the Local Area Network. It is done through control of redundant link which connects to the same segment of network. Each segment of network is allocated with signal designated port which is used to forward traffic into it. All segments on access point are enabled but in all blocking state it disallows flowing of traffic. If there is any failure in the forwarding port, access point of network segment is allowed through blocking port transitioned in the forwarding state. The process of transition includes number of states, which are shown below:

STP Port States

Every Port starts blocking the states when STP Ports seeks to switch to the environment, once the ports are in forward state it is completely operational and it starts to forward frames. The major drawback is that it can be used in any network in modern state, because it takes long time to transit from blocking state to forwarding state. All the major issues are addressed through RSTP (Rapid Spanning Tree Protocol); most of the recent switching environments operate through RSTP over STP for evident reason.

How does STP work to prevent loops?

Creating a loop free SIP network with STP has a lot to do with having the right measures put in place. Technology has come a long way and will always be with us to make our lives the very best. When there is idleness in a particular network it literally means the network creates two diverse trails to a specific target or goal. This means, when one trail is not working or blocked, the other can be used perfectly. Today, there are so many companies and organizations that strongly rely on their system networks and networks of all sorts in order to ensure that work runs smoothly. This is why STP is needed to ensure that there are no loops in networks.

When there is any loop in the network of an organization, there are so many disadvantages that it causes. For instance; customer service will be reduced which might lead to many client’s not served like they would want to, clients might go to competition for same services which will lead to loss of profits, etc. However; every good network technician will advise that you prevent loops in network by configuring or building up your network switches with what is known as Spanning Tree Protocol (STP). The main aim of STP is to avert or stop switching loops. Spanning Tree Protocol is an open standard protocol that is mainly used in a switched setting to generate loop free logical topology.

In order for STP to help prevent loops in your network, it puts pressure on specific lines or interfaces and puts them into a blocked status or on reserve. Also, STP rebuilds the company’s SIP network by making active the right reserve trail especially when the onward trail is not available to be effectively utilized. One thing that you must know about Spanning Tree Protocol is that, it mostly needs fewer configurations. Also, it is also very independent.