SIP Registration Server

The registration server’s functionality typically stands in setting up and tearing down functionality with a client by using the registration and invite requests as well as clearing and retrieving registrations from a SIP url.

Register notion

The Session Initiation Protocol provides the REGISTER functionality that is used mainly in a proxy configuration case. For what reason? The answer is quite simple. It’s about locating individual users in case of a call, which is similar to an INVITE message sent to the server.

Message flow in registration of a SIP user agent on a registration server

The actual registration of a SIP user agent on a registration server is made using a pretty simple message flow like it follows:

• The user agent sends a REGISTER request to the server.
• The server answers with 401 Unauthorized.
• The user agent sends another REGISTER request with authorization information.
• The server acknowledges the registration by sending back 200 OK.

By changing some fields in the message, the registration cancelling is performed. Interrogation of the server to identify contacts associated with a SIP url are made in the similar way.

Yate as a SIP registrar

In order to use Yate as a SIP registrar you can use one of the following modules:

• regfile.conf - the users will be set in a file
• register.conf - the users will be set in a database
• define custom module or script that handles: user.auth, user.register, user.unregister and call.route messages

Configure regfile module

Module regfile is used for autentication, registration, and routing of users configured in a file.

regfile.conf

[general]
; auth setups the user.auth handler priority
auth=100
; register setups the user.register and user.unregister 
; handlers priority
register=100
; route setups the call.route handler priority
route=100
; file: string. An auxiliary conf file used to save and load from it autocreated and registered entries
; If file don't exists the registered entities will be lost on reload
file=/path/filename

If you want to limit the access to make calls only to autenticated users you have to setup in regexroute.conf in section [default] this line:

${username}^$=-;error=noauth

Configure register module

Module register used for autentication, registration, and routing of users from database.

Module mysqldb or module pgsqldb can be used to make the connection between Yate and a database.

See more how to configure register.

See also

• SIP in Yate
• Regfile module
• Register module