Found it. RFC3261 Section 10.2.1.2. Suggest quoting just that so it reads:

  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 (as defined in RFC3261 Section 10.2.1.2) and a destination
      list for the peer.

I assume the actual value of the contact preference will be a string like

  "0.7" or "0.1", etc.

Thanks

--Michael

-------- Original Message --------
Subject: What is SipRegistrationData.contact_prefs?
From: "Michael Chen" <[email protected]>
Date: Tue, January 05, 2010 4:59 pm
To: [email protected]

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
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