Technical data

6 Brocade ServerIron ADX Advanced Server Load Balancing Guide

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SIP SLB and call persistence

Figure 2 shows an overview of a ServerIron ADX SIP server load balancing implementation.

FIGURE 2 ServerIron ADX SIP Server Load Balancing implementation

There are three kinds of SIP servers:

• Proxy server

• Redirect server

• Registrar server

In Figure 2, the ServerIron ADX SIP SLB uses the Domain-1 VIP to load balance SIP requests from

Client A (user1) or Client B (user2) among Domain 1 proxy servers and registrar servers.

The SIP Server Load Balancing uses the Domain-2 VIP to load balance SIP requests from Client A

(user1) or Client B (user2) among Domain 2 proxy servers and registrar servers.

The ServerIron ADX offers support for the following SIP servers in accordance with RFC 3261:

• Proxy

• Redirect

• Registrar

The ServerIron ADX supports the following methods in accordance with RFC 3261:

• INVITE

• REGISTER

• ACK