> I could be convinced that there should be some normative 
> specification of the *minimum* message size that all sip 
> clients and servers MUST be prepared to support.

RFC 3261 section 18.1.1 currently provides a normative minimum:
"However, implementations MUST be able to handle messages up to the
maximum datagram packet size.  For UDP, this size is 65,535 bytes,
including IP and UDP headers."

Are devices actually exceeding the minimum required by RFC 3261?  Or are
vendors interpreting "handle" as though it is valid to return failure
responses because of size even though less than the normative minimum to
handle?
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