Hi Mike,
Thanks for the quick response. Here are a few more questions / comments below:
1. How do I translate conference cli commands (e.g. "conference xxx mute yyy") into a dialplan xml actions?You don't really. Why exactly would you want to do this?
4. I'd like to have some private conferences that only certain callers can join. I'll know the callers' ids before hand. I'm assuming a reasonable way to handle is with user groups. How would I test if a user is a member of a particular group?
If your doing dialplan via mod_xml_curl you can do all that validation in your dialplan lookup.