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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 65
T.30 Phase B Negotiation Responses
The modem will provide the on-line status of several session parameters when they are available in
the T.30 handshaking and if enabled via the +FNR subparameters. These include the remote ID
string and the DIS/DCS/DTC parameters.
Report DIS/DCS/DTC Frame Information
Class 2.1 +FCS:, +FIS:, +FTC:
Syntax: +FCS:VR,BR,WD,LN,DF,EC,BF,ST,JP Current Session
Syntax: +FIS:VR,BR,WD,LN,DF,EC,BF,ST,JP Remote Identification
Syntax: +FTC:VR,BR,WD,LN,DF,EC,BF,ST,JP Request for Polling
T.32 reference: 8.4.2.1
These responses report the T.30 session parameter frames. The subparameters are
described in Table 3.5.
+FCS:<string> reports the negotiated parameters. Phase C data will be formatted as
described by the subparameters. This message may be generated in execution of
+FDT or +FDR commands before the CONNECT result code if new DCS frames are
generated or received.
+FIS:<string> and +FTC:<string> report remote facsimile station capabilities and
intentions. If the remote has a document to poll, a +FPO response will trail
+FIS:<string>; if the remote station wants to poll, the +FTC:<string> response is
generated. These messages are generated in execution of Originate, Answer, +FDT
and +FDR commands.
Class 2 +FDCS:, +FDIS: +FDTC:
Syntax: +FDCS:VR,BR,WD,LN,DF,EC,BF,ST Current Session
Syntax: +FDIS:VR,BR,WD,LN,DF,EC,BF,ST Remote Identification
Syntax: +FDTC:VR,BR,WD,LN,DF,EC,BF,ST Request for Polling
The Class 2 responses are essentially the same as the Class 2.1 responses, except
that Class 2 lacks the JP subparameter, and the sets of values supported for each
sub-parameter is a subset of class 2.1 values. See table 3.5 for more information.
Remote Polling Indication
Class 2.1 +FPO
Syntax: +FPO
T.32 reference: 8.4.2.2
The +FPO response indicates that the remote station has a document to poll and
invites the host to poll it. This response is generated in execution of Originate)
Answer), +FDT) and +FDR) commands. +FSP=0 inhibits the +FPO response
(2.5.1.9).The host may respond to an +FPO message with either the begin transmit
command, AT+FDT, if it does not wish to poll, or the +FDR command, to indicate
willingness to poll the remote station.
Class 2 +FPOLL
Syntax: +FPOLL
The Class 2 response is essentially the same as the Class 2.1 response.