PioneerPOS G24-LC 用户手册

This execution command returns an extended error report containing one or more lines of 
information text <report>, determined by the manufacturer, providing reasons for the following 
errors:

Failure in the last unsuccessful call setup (originating or answering) or the in-call 
modification.

Last call release.

Typically, the text consists of a single line containing the reason for the error according to 
information given by GSM network, in textual format.