Modem Command Strings

I wonder if anyone can help me understand what is going on in the
following modem command strings? They are amongst the strings used to
initialise a, now obsolete, Complemetary Technology Ltd OEM-MODEM-34 v34
modem and I am trying to work out what is going on so I can initialise
my shiny new Multitech RJModems in the same way. The tricky strings are:

AT&F0S0=1S28=0S37=9E0%T21,18,0\r\0
ATS0=1S28=0E0&N6S32=120\r\0
AT%T21,2f,4\r\0

The codes I've cracked are:
&F0 (Load Factory setttings)
E0 (no echo)
S0=1 (1 ring before autoanswer)
S28=0 (V34 modulation disabled - whatever that is)
S37=9 (Negotiation speed (9600))

The ones I'm not sure about are:
S32=120 (From some places this is Xon character and is 120 (lower case
x? not likely) but this is a Lucent modem and this could be Synthetic
ring volume.)
&N6 (no idea - never seen it anywhere)
%T21,18,0
%T21,2f,4 (I think that %T21 is modifying a homologation factor -
whatever that is)

There is another string %T19,0,19 when the modem in for the US which I
believe sets the country code.

I used these commands with the RJModem and it worked OK for a while and
then dropped the connection but I'm not sure what could be causing that.


.

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