Pr od uct io n Ne tw ork Ar ch it ect ur es an d Web Lo gic SI P S er ver Con f igu ra t ion
z Multiple engine tier servers arranged in a cluster.
z Multiple network channels per engine tier server instance, in support of multiple SIP
transport protocols or multiple Network Interface Cards (NICs) on multihomed hardware.
z One or more load balancers, or a multihomed load balancer, performing server failover and
possibly Network Address Translation (NAT) for source or destination network packets.
A combination of these network elements can make it difficult to understand how elements
interact with one another, and how a particular combination of elements or configuration options
affects the contents of a SIP message or transport protocol datagram.
The sections that follow attempt to describe common WebLogic SIP Server network
architectures and explain how servers are configured in each architecture. The sections also
explain how information in SIP messages and transport datagrams is affected by each
configuration. Figure 2-1 shows the typical Open Systems Interconnect (OSI) model layers that
can be affected by different network configurations.
Figure 2-1 OSI Layers Affected by WebLogic SIP Server Network Configuration
Layer 3 (Network) and Layer 4 (Transport) contain the source or destination IP address and port
numbers for both outgoing and incoming transport datagrams. Layer 7 (Application) may also be
affected because the SIP protocol specifies that certain SIP headers include addressing
information for contacting the sender of a SIP message.
2-2
Configuring Network Resources