[Sip] Question on Service Route Discovery draft and multiple contacts per AoR

The current text in draft-ietf-sip-scvrtdisco-03.txt says, in "6.3
Procedures at the Registrar":

   A REGISTER operation performing a Fetching Bindings (i.e.  no Contact
   header field is present in the request) SHOULD return the same value
   of Service-Route as returned in the corresponding previous REGISTER
   response for the address-of-record in question.  In some cases, the
   Service-Route may be dynamically calculated by the registrar rather
   than stored, and the decision as to whether this route should be
   recalculated in the event of a Fetching Bindings operation is left to
   the implementation.

Ben Jenkins pointed out to me that this may be unclear in cases where there
are multiple contacts registered for a specific AoR.

We do not state explicitly that the Service Route is common to all contacts
for the AoR. Is it really? Do we need to add anything here for clarity?

--
Dean

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