Cisco introduced a patch to its CallManager softPBX that adds encryption of voice channels on its mid-range 7940 and 7960 IP phones. This feature has cost them a lot of business to Avaya over the last year. Naturally, since voice encryption is something freeware softphones already do, it was definitely a conspicuous omission on Cisco’s voice roster. Check the link for more info.
How important is phone call encryption to you?