16.11. Using RADIUS

16.11. Using RADIUS
	Chapter 16. VoIP

RADIUS can be used to allow new handsets to be registered dynamically without individual configuration by using RADIUS authentication to an external RADIUS server. RADIUS is also used to make call routing decisions.

RADIUS accounting can be used to log calls as they start and end to an external RADIUS server.

16.11.1. RADIUS accounting

RADIUS accounting logs each call leg, so a typical call has an incoming and outgoing leg.

A RADIUS START message is sent when the call leg is created.
A RADIUS INTERIM update is sent if/when the call connects (i.e. status 200).
A RADIUS STOP message is sent when the call ends, even if it did not connect.

The update includes the call duration, which is the time spent ringing for the interim update, and the connected duration in the stop message. The event timestamp sent is the start of the call, even in the stop message.

16.11.2. RADIUS authentication

RADIUS authentication is used for REGISTER and INVITE messages, and any may be used for some others in future.

Tip

The initial message received will not have authentication details. You can have a RADIUS authentication at this stage and reply with an access challenge by setting the radius-challenge settings. Otherwise the FB6000 will send a challenge automatically and only send a RADIUS authentication when the authenticated message is received.

For registration the reponse allows the registration or rejects it. If allowed, a called-station-id attribute can be used to define the registered connection as a tel:number URI for call routing. Without this, the registration is not logged on the FB6000 and it is assumed the RADIUS server will record where to send calls based on the registration.

Note

RADIUS for use with VoIP is still in development. The plan is to make the logging track a connected call better allowing call legs to be associated with each otehr, and also allowing a defined chargeable user identity to be associated with the call.


16.10. Busy lamp field		16.12. Call recording