The Max-Forwards header field must be used with any SIP method to limit
the number of proxies or gateways that can forward the request to the next
downstream server.
This interface provides factory methods that allow an application to create
Request and Response messages from a particular implementation of JAIN SIP.
This is the Stack abstraction for the active object that waits for messages
to appear on the wire and processes these messages by calling the
MessageFactory interface to create a ServerRequest or ServerResponse object.
The user can no longer be found at the address in the Request-URI, and
the requesting client SHOULD retry at the new address given by the
Contact header field.
The address in the request resolved to several choices, each with its
own specific location, and the user (or UA) can select a preferred
communication end point and redirect its request to that location.