SIPS URI
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... proxy. As a result, in all cases, the
problem boils down to resolution of a SIP or SIPS URI in DNS to
determine the IP address ...
... SIP URI, and TCP
for a SIPS URI. Similarly, if no transport protocol is specified,
and the TARGET ...
... UDP for a SIP URI, and TCP for a SIPS URI. This is
because UDP is the only mandatory transport ...
...
First, a client resolving a SIPS URI MUST discard any services that
do not contain "SIPS" as the protocol in the service field ...
... SRV records are found, the client SHOULD use TCP for a SIPS
URI, and UDP for a SIP URI. However, another transport protocol ...
... Transport Determination Application, and its goal is to
map an incoming SIP or SIPS URI to a set of SRV records for the
various servers that can handle the URI ...