Hello, This version is required for new net-voip/linphone-2.4.1, see bug 354533 for details. Actually this is a bugfix release bundled with linphone-2.4.1. No changes to ebuild are required, just rename.
Created attachment 265169 [details, diff] ortp-0.16.4.ebuild.patch Old URL is no longer valid, use linphone.org instead.
Created attachment 267739 [details, diff] ortp-0.16.5.ebuild.patch ortp-0.16.5 is released now
Thank you for report. New version was just added to the tree.