Subject: [P2PSIP] What is SipRegistrationData.contact_prefs?

From: "Michael Chen" <[email-masked]>
Date: Tue, 05 Jan 2010 17:59:19 -0700

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