Chapter 3 – Fax Class 2 Commands

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.

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C)

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Multi-Tech Systems MT5634SMI V.34 Phase B Negotiation Responses, Class +FCS, +FIS, +FTC, +Fdcs, +Fdis +Fdtc, +Fpoll
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