| Summary: |
In many deployment configurations, Session Initiation Protocol (SIP)
clients are capable of initiating connection requests towards their
SIP server, but the SIP server cannot open connections towards the
client. Specifications have been developed which allow for a
client-initiated connection to be used for incoming requests towards
the client. This outbound connection involves the use of a SIP proxy,
called an outbound proxy, that the client connects to. However, the
specification does not provide a means to discover the outbound proxy,
nor does it support high availability for failures of the outbound
proxy mid-dialog. This specification fills those gaps. The resulting
mechanism additionally provides solutions for inter-proxy connection
reuse and usage of certificates with SIP.
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