From: "Stephan Steiner" <[EMAIL PROTECTED]>

   Shouldn't the reply contain the following Contact header for full RFC 3261 
   compliance:

   Contact: <sip:[EMAIL PROTECTED];transport=UDP>;expires=360
   (I added the brackets because the transport requires a semicolon in the URI 
   and then according to 20.10 you have to use the brackets even if no display 
   name is present)

After reading 19.1.4 reasonably carefully, it looks like you're
exactly correct. 

In practice, adding the default ":5060" to an IP address is a no-op,
but because it can be significant for DNS names, 19.1.4 is unambiguous
that it cannot be added or deleted.  At first, I thought that the
transport parameter fell under the rule "All other uri-parameters
appearing in only one URI are ignored when comparing the URIs.", but
the transport parameter is explicitly exempted from that rule in the
preceding point of the section (which is confirmed by the examples).

Dale
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