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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 64
Modem Responses
The modem sends information responses to the host as a facsimile session proceeds. Responses
convey needed information and indicate the state of the facsimile session. These responses are
solicited messages, generated in execution of host action commands described in Action Commands
section.
The modem precedes all of the following information responses with <CR><LF>, and follow them with
<CR><LF> if in verbose mode (ATV1) or follow them with just a <CR> if in terse mode (ATV0).
T.30 Phase A Negotiation Responses
Facsimile Connection Response
Class 2.1 +FCO
Syntax: +FCO
The +FCO response indicates connection with a Group 3 facsimile station. It is
released by detection of HDLC flags in the first received frame. +FCO is generated in
response to an Originate command (2.3.1) or an Answer command (2.3.2).
Class 2 +FCON
Syntax: +FCON
The Class 2 response is essentially the same as the Class 2.1 response.
Transition to Data Modem, +FDM
Class 2.1 +FDM
Syntax: +FDM
The +FDM response indicates that the modem has identified that the calling device is
a data modem. The modem issues this response immediately upon recognition of a
data modem. The +FDM response precedes any data modem information text or
result codes.
Class 2 There is no equivalent response in Class 2.