[sipcore] RFC 6223 on Indication of Support for Keep-Alive

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        RFC 6223

        Title:      Indication of Support for Keep-Alive 
        Author:     C. Holmberg
        Status:     Standards Track
        Stream:     IETF
        Date:       April 2011
        Mailbox:    christer.holmberg@ericsson.com
        Pages:      18
        Characters: 41439
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-sipcore-keep-12.txt

        URL:        http://www.rfc-editor.org/rfc/rfc6223.txt

This specification defines a new Session Initiation Protocol (SIP)
Via header field parameter, "keep", which allows adjacent SIP
entities to explicitly negotiate usage of the Network Address
Translation (NAT) keep-alive mechanisms defined in SIP Outbound, in
cases where SIP Outbound is not supported, cannot be applied, or
where usage of keep-alives is not implicitly negotiated as part of
the SIP Outbound negotiation.  [STANDARDS-TRACK]

This document is a product of the Session Initiation Protocol Core Working Group of the IETF.

This is now a Proposed Standard Protocol.

STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Internet
Official Protocol Standards (STD 1) for the standardization state and
status of this protocol.  Distribution of this memo is unlimited.

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