What is SIP and Tel URI?

The URI full form means Universal Resource Identifier, a resource could be anything like a document, a record, etc.  In this tutorial, we will describe two formats SIP and Tel for a URI for SIP protocol.

In the SIP protocol, there are fields for addressing, To, From, etc. Each contains a URI. A URI is the basics of multimedia IP communication.

The SIP URI is specified in RFC 3261 and Tell URI in RFC 3966.

The SIP URI is like the name of a resource on a server.  Like an email address, e.g cspsprotocol@gmail.com. It is globally unique with a user name and domain name. If someone has to access resources, first need to reach to the server, that to the resource.  For example, a mail sent to the cspsprotocol@gmail.com first reaches the Gmail server and then goes to the account associated with cspsprotcol user.

Sip URI Examplesip:+917876788@mnc345.mcc123.3gppnetwork.org

A TEL URI is a phone number, it can be for landline or mobile, etc.

Tel URI Example –  tel:+9885566666


What is SIP URI?

The sip URI means  Universal Resource Identifier.  It an address to an IP device over the SIP protocol.  When you need to reach a VoIP phone, you need to dial the sip URI.  This may have many parameters. But here we will discuss a few basic ones.

The format is sip:user:password@host: port;

  • user – The name of the resource on the host.
  • password – A password association with host account. Generally, the use of a password is not recommended.
  • host – A domain name like www.iphoneservice.com or an IP address.
  • portUDP or TCP port, if not specified, default port 5060 is used.

You can see that, it’s totally different from the way the GSM phone number works.  The reason is that essentially VoIP was assumed to be a totally different network. It will have all its network components and identities.

What is Tel URI?

You can be imaging a TEL URI is a telephone number.

Example – tel:+91234555.

With it, a regular phone number can also be used for calling over the IP network.  For international numbers, it is E.164 format.