[Sipping] Question on draft-ietf-sipping-v6-transition-07

["Elwell, John" <john.elwell@xxxxxxxxxxxxxxxxxxxxxx>]

" 1.  In some cases, especially those dealing with third party call
       control (see Section 4.2 of [12]), there arises a need to specify
       the IPv6 equivalent of the IPv4 unspecified address (0.0.0.0) in
       the SDP offer.  For this, IPv6 implementations MUST use a domain
       name within the .invalid DNS top-level domain instead of using
       the IPv6 unspecified address (i.e., ::)."

Can somebody recall the reason for this? Both "0.0.0.0" and "::" mean "unspecified" in their respective IP versions.

John
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