The Diameter Sip Application : General

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The Diameter Sip Application : General 

 
The Diameter SIP application can be used in a SIP environment where
an interface to a AAA infrastructure is required to authenticate and
authorize the usage of SIP resources. This application provides
support for SIP User Agents and proxies that implement and use HTTP
Digest authentication [RFC2617], which is the authentication
mechanism mandated by SIP [RFC3261]. The application is extensible
and, if need arises, it can be extended to provide support for other
authentication mechanisms or extensions to HTTP Digest authentication
when they occur.
   This application provides limited support for accounting services as
follows: the Diameter server is able to provide the addresses of
accounting severs to the Diameter client. Figure 1, below, shows a
general overview of the integration of the SIP architecture with the
AAA architecture.

According to Figure 1, there are one or more SIP User Agents (UAs)
that initiate or terminate SIP traffic through one or more SIP
servers. Both SIP servers implement a Diameter client that supports
the Diameter application described in this specification.
                              +--------+
UAR/UAA +--->|Diameter|<----+ PPR/PPA
LIR/LIA | | server | | MAR/MAA
| +--------+ | SAR/SAA
| | RTR/RTA
| |
v v
+------+ SIP +--------+ SIP +--------+ SIP +------+
| SIP |<--------->| SIP |<-------->| SIP |<--------->| SIP |
| UA | |server 1| |server 2| | UA |
+------+ +--------+ +--------+ +------+
^ ^
UAR/UAA | |
LIR/LIA | | MAR/MAA
| +--------+ | SAR/SAA
+--->|Diameter|<----+
| SL |
+--------+

Figure 1: Architecture of the Diameter application for SIP

In Figure 1, it can be seen that SIP server 1 sends different
Diameter commands and receives different responses than those sent
and received by SIP server 2. This is because SIP server 1 in
Figure 1 is located at the edge of a network, and its main task is to
locate SIP server 2. SIP server 2 is requesting and receiving
authentication and authorization data from the Diameter server and is
not located at the edge of the network.


 

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