A very very good idea ! The idea of an answering machine built into the user agent in the SIP spec should have been in there from the getgo, at least as an option. In addition to remote voicemail, there should be a local voicemail option directly in the SIP user agent spec through RFC with the IEEE. OBI needs this feature so that it's not dependent on a common server except for voice conferencing. This would increase the military usefulness of the distributed phone system when not using a PBX. I think the reason local voice answering function was not put into the original SIP spec is that the SIP spec was written long before we had cheap flash memory. OBI should consider doing this through RFC with the IEEE.