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LESSON 4: SIP ADDRESSING



If you hate long posts as I always suggest go through this video lesson (click here)

Hello everyone! 

Today we are going to deal with topic “SIP Addressing”. I have talked about it a bit in the earlier post i.e. SIP PROXY SERVER.

SIP Address
  • An address which identifies an user, a device or a service.
  • SIP addresses are represented in the form of URI [Uniform Resource Identifier]. It exactly looks like our email address.
  • SIP uses a number of URIs. Common URIs are shown below

user@host

    where,        user = it can be a name (or) telephone number
            host = Domain Name (or) IP Address
Eg:
            sip:+914022222222@172.1.1.1:5060
            sip:+914022222222@abccorp.com:5061
            sip:rajeshkumart@abccorp.com:5061
            sip:rajeshkumart@172.1.1.1:5060
            sips:ranadeep@abccorp.com:5062
            sips:rajeshkumart@216.162.10.10:5060

  • For SIP, the URI scheme is either sip for a normal SIP URI or sips for a Secure SIP URI. Secure SIP means that SIP message sent over TLS connection.   


Types of URI

There are 3 main types of URI:
  1. Service: This URI could point to a conference unit are meeting ID that users can join.
  2. Device: This URI represents a single end-point are application such as laptop,IP phone etc
  3. User: This URI can be something like sip:rajeshkumart@abccorp.com that can identify a specific user in a domain. This URI can be mapped to as many other SIP URIs as the user wants. This URI sometimes known as Address Of Record [AOR].


The primary goal of SIP is to provide all the users with a single URI (AOR) which when used in conjunction with DNS will reveal the complete information about that user. In the real world, it is quite possible that a single user may use multiple devices (or) applications but can be identified with a single URI. Following is the example of one SIP call which will more clarity around this.







In the above diagram you see ranadeep@abccorp.com is calling rajeshkumart@abccorp.com
  • Ranadeep UA sends an INVITE request to SIP Proxy in abccorp.com Domain
  • The called party (rajeshkumart) already registered from 3 devices like IP Phone, Mobile Phone, Laptop.
  • In short we can say that User URI(rajeshkumart@abccorp.com) is mapped with 3 D cwevice URIs like above mentioned.
  • After finding the AORs from location service, the SIP Proxy forwards INVITE request to all 3 device URIs. Now, rajeshkumart can answer the call from any device. This is called Forking.

     

Hope this helps!

Thanks,
Rajesh Talluri,
http://telecomtechsource.blogspot.in

   
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Location: Hyderabad, Telangana, India

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