Technical data

20 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-03
Configuring SIP SLB
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Figure 8 shows how the ServerIron ADX performs reverse source NAT on SIP server-initiated traffic.
FIGURE 8 SIP proxy server-initiated SIP requests
Load balancing modes
The ServerIron ADX can be enabled in one of the following modes while performing TCP SIP server
load balancing:
• Stateless: The system maintains an internal hash table to ensure SIP call persistence.
• Stateful: The system creates session table entries to ensure SIP call persistence.
Global SIP over TCP commands
Use the following command to configure the maximum number of TCP-based client connections.
ServerIronADX(config)# server sip tcp max-client-tcp-connections 25
Syntax: [no] server sip tcp max-client-tcp-connections <#-of-connections>
The <#-of-connections> variable can be from 1 through 64 connections, which specifies the
maximum number of concurrent TCP connections that ServerIron ADX can actively open to a
specific event.
Use the following command to configure the maximum number of TCP-based server connections.
ServerIronADX(config)# server sip max-server-tcp-connections 25
Syntax: [no] server sip max-server-tcp-connections <#-of-connections>
The <#-of-connection> variable can be from 1 through 64 connections, which specifies the
maximum number of concurrent TCP connections that ServerIron ADX can actively open to a
specific server.
Use the following command to limit the maximum number of TCP transactions.
ServerIronADX(config)# server sip tcp max-tcp-transaction-limit 200,000
Syntax: [no] server sip tcp max-tcp-transaction-limit <#-of-transactions>
The <#-of-transactions> is the concurrent SIP transactions that a ServerIron ADX can manage.
Enter 10 - 300,000 for <#-of-transactions>. The default value is 100,000.
SIP phone
SIP phone
SIP Proxy Server
Call-ID2...
Call-ID1...
ServerIron
Call-ID1...
Call-ID2...