If iChat doesn't use the XMPP standard for audio/video calls (Jingle), then implementing support for whatever it *does* use is a quite extensive piece of feature work, rather than just a bugfix. (severity normal -> enhancement)
If iChat doesn't use the XMPP standard for audio/video calls (Jingle), then implementing support for whatever it *does* use is a quite extensive piece of feature work, rather than just a bugfix. (severity normal -> enhancement)