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The GetPort function returns the port specified in a SIP URI.
Returns the port number. Returns 0 if the requested data is not found or if the URI passed in is not a valid SIP URI in the form specified above. Live Communications Server 2003 applications that pass non-SIP URI strings to this function need to be modified to work properly with Office Communications Server 2007.
The port value occurs in a SIP URI after the hostname and separated by a colon. For example, a URI with a specified port appears as "sip:firstname.lastname@example.org:6767" with the port being 6767.