When configuring a SIP application router, you can either use the default application router or create a custom application router.
The Asynchronous Invocation API transfers the event task to the correct server.
The Domain Resolver API provides an interface that enables an application to perform DNS queries for SIP URIs.
The SIP container provides the UnmatchedMessageListener API interface that enables an application to receive all incoming request or response messages that cannot be matched to any existing dialogs. Any messages that are not matched to an existing dialog are known as unmatched requests or unmatched responses.
SIP proprietary header fields enable certain SIP settings to be implemented on a per message basis. SIP settings set at the SIP container level apply to all SIP messages handled by that SIP container.