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[P2PSIP] That is SipRegistrationData.contact_prefs?



Hi,

In the current draft-ietf-p2psip-sip-03, there is no definition for field:

  SipRegistration.SipRegistrationData.contact_prefs

   o  If the registration is of type "sip_registration_route", then the
      contents are an opaque string containing the callee's contact
      preferences and a destination list for the peer.

What is contact preferences?

Thanks

--Michael