a per-call basis. amaflags Automatic Message Accounting, an archaic system that "flags" CDR for post-processing. Commonly used flags are billing, default, documentation, omit. answer_epoch UNIX epoch value when the call was answered, eg. 1294060468 for Mon, 03 Jan 2011 13:14:28 GMT. answer_stamp Timestamp when the call was answered (eg, SIP 200