If you have a properly installed modem .inf file, you normally don't need any initialization string or extra settings when using DUNS (dial-up-networking) - the .inf file determines the init string which - when everything works right - gives you the best connection possible. But, it doesn't always work that way, and sometimes you can improve your connection by adding extra settings (additional initialization string). Many command formats are specific to different modem chipsets. Below the screenshot showing where you go to add extra settings are some 56k-related commands for various modem chipsets.
 

To get to the screen for adding Extra Settings: START -> Settings -> Control Panel -> Modems -> Properties -> Connection -> Advanced AT should not be used as part of the string, and normally, you should not use &F or Z as these reset the modem to factory, or other, settings which override the settings sent by DUNS based upon the .inf file.

 

Modem	Disable x2	Disable v.42	Disable V.90	Disable V.90 & x2
Sportster/USR	S32=34	S15=128	S32=66	S32=98
Courier	S58=1	S27=32	S58=32	S58=33
Cirrus MD56xx	+MS=V90,0	\N2*H0 *	+MS=X2,0	+MS=V34,1,0,33600
ESS / Teledrive	+MS=17,0	\N5	+MS=12,0	+MS=11,0
	Disable KFlex	Disable V90	Disable V90&Flex	Disable v.42
Rockwell Dual	+MS=12	+MS=56	+MS=11	&Q6
Rockwell HCF & Soft56	+MS=V90,0	+MS=K56,0	+MS=V34	+ES=1,0,1;
Lucent LT	s38=0	-v90=0	s38=0-v90=0	\n2
Lucent Venus	s109=2	s109=0	s38=0	\n2
PCTel HSP	n0s37=14	n0s37=13	n0s37=12	*
Motorola SM56	*MM15	*MM13	*MM12

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