Description of the Modem Responses Key in the Windows 98/95 Registry

• Microsoft Windows 98
• Microsoft Windows 98 Second Edition
• Microsoft Windows 95

SUMMARY

This article describes the following modem Responses key in the Windows 98/95 registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\Modem\xxxx\Responses

MORE INFORMATION

The Responses key contains strings that the modem might report to Windows 98/95 in response to a command or during the connection process. The name of each subkey is the text of a single modem response, and its data is a 10-byte binary value specifying the meaning of the response to Windows in a coded format. The first two characters (byte 0) specify the meaning of the response code, using one of the following values:

Value	Type	Description
00	OK	The modem accepted the previous command.
01	Negotiation Progress	Status information about a new connection is being reported.
02	Connect	A call is connected; the modem is in data mode.
03	Error	The modem rejected the precious command.
04	No Carrier	The call was disconnected.
05	No Dial Tone	No dial tone is present.
06	Busy	The dialed modem is busy.
07	No Answer	The dialed modem did not answer.
08	Ring	There is an incoming call.
1C	Blacklisted	The remote number does not answer as a modem.
ID	Delayed	The user should wait before trying this call again.

NOTE: The 1C and ID values are not included in Windows 95.


The second two characters (byte 1) specify information about a connection that is being made. It is used only for response codes of Negotiation Progress or Connect types, and is one of the following values:

Value	Error control negotiated	Compression negotiated	Cellular protocol negotiated
00	--	--	--
01	--	X	--
02	X	--	--
03	X	X	--
08	--	--	X
09	--	X	X
0A	X	--	X
0B	X	X	X

The next eight characters (bytes 2-5) specify the modem-to-modem line speed negotiated in bits per second (bps). The characters represent a 32-bit integer, doubleword format (byte and word reversed). Common examples for this value include the following:

Bits per second	String
2400	60 09 00 00
9600	80 25 00 00
14400	40 38 00 00
19200	00 4b 00 00
28800	80 70 00 00
33600	40 83 00 00
56000	C0 DA 00 00

The last eight characters (bytes 6-9) indicate that the modem is changing to a different port or Data Terminal Equipment (DTE) speed. Usually, this field is not used, because modems make connections at a "locked" port speed, regardless of the modem-to-modem or Data Communications Equipment (DCE) speed. However, for modems that support only "direct" modes, you can lower the DTE speed by specifying a negotiated DTE speed for a response code, using the same format as the DCE speed described in the preceding table.

Additional query words:

Keywords : kbtool win95 win98 win98se
Version : WINDOWS:95
Platform : WINDOWS
Issue type : kbinfo