Update list for Linphone
Linphone 3.5.2 changelog from September 12, 2012
This release brings a "wizard" tool to help users to create SIP accounts, the ZRTP media encryption and the support for SILK audio codec.
Linphone 3.5.0 changelog from January 14, 2012
This release brings various fixes, the audio conferencing, the SRTP media encryption, a new video codec (VP8), a new audio codec (G722) and two new network protocols : SIP/TCP and SIP/TLS.
Older Linphone versions:

