Indication of Support for Keep-Alive
RFC 6223, “Indication of Support for Keep-Alive”, is a Proposed Standard document published in April 2011 by C. Holmberg. The canonical text is published by the RFC Editor.
Abstract
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]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 6223 is hosted at rfc-editor.org. Available in TXT,HTML.
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