The Session Description Protocol Alternate Connectivity Attribute
RFC 6947, “The Session Description Protocol Alternate Connectivity Attribute”, is an Informational document published in May 2013 by M. Boucadair, H. Kaplan, R. Gilman, S. Veikkolainen. The canonical text is published by the RFC Editor.
Abstract
This document proposes a mechanism that allows the same SDP offer to carry multiple IP addresses of different address families (e.g., IPv4 and IPv6). The proposed attribute, the "altc" attribute, solves the backward-compatibility problem that plagued Alternative Network Address Types (ANAT) due to their syntax.
The proposed solution is applicable to scenarios where connectivity checks are not required. If connectivity checks are required, Interactive Connectivity Establishment (ICE), as specified in RFC 5245, provides such a solution.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
The canonical text of RFC 6947 is hosted at rfc-editor.org. Available in TXT,HTML.
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