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 a 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 sends back an acknowledgement message.

By changing some fields in the message the registration canceling is performed. Also interrogation of the server to identify contacts associated with a SIP url are made in the same way.

Yate as a SIP registrar

The module used for configuring Yate are:

• regfile.conf
• register.conf

Configure regfile module

Module regfile used for autentication, registration, and routing of users from 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

Register file

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

See more how to configure register.

See also

• SIP in Yate
• Regfile module
• Register module