Telenetics 56 - Manual (Page 105)

AT Commands
Page 97
Monitoring an Active Connection
This command is intended for use after call termination. However, codes are defined so
that a modem can respond before the first call is placed, and during a call for live
monitoring purposes. For example, key 60, call termination, has value 1 defined,
indicating that the call is still in progress.
There are at least two ways to do this. First, the DTE could switch the modem to On-Line
command state, issue the command, capture the responses and then issue an ATO
command. For smoother on-line monitoring, in-band means defined in ITU V.80 are
recommended if available in the modem. If V.80 methods are used, each response line
shall be a separate extended in-band message.
Notes for Tables
1. The modem may insert a delay (e.g., 10 ms) between information text lines.
2. The code tables include values for data and fax calls. Some of the codes are
applicable only to data calls (e.g., data compression), some are applicable
only to call origination (e.g., busy, answering signal detection) and some are
applicable only to the answering modem (e.g., calling signal detection).
callCleared codes from 3.6.4/V.58-1994
callCleared: indicates that the DCE has gone on-hook and that the previously existing
network connection has been cleared. These value are hex, converted from decimal in
V.58. callCleared codes are described in Table A-4.