> impossible to create the moptions with 
> 
> -a Type#0="%D1%"
> -a Itel#0="%zItel%"
> 
> the variable are set to 
> set D1=Tel
> set zItel=Tel.gif
> 
> other standard option work fine

Sure it works. But in your elogd.cfg, you have ROptions, not MOptions! I 
changed this to 

...
IOptions Itel = Tel.gif, TelDirect.gif, Fax.gif, Gsm.gif, Tel2.gif, 
TelHome.gif,TelFax.gif,TelHelp.gif
MOptions Type = Tel,TelDirect,Fax,Gsm,Tel2,Home,Combine,TelHelp
...

Then I added a batch file elog_submit.bat with following contents:

elog -h 'my site elo' -p 83 -l 'my logbook' -a Phone=%1 -a Contact="%2 %3" -a 
Type#0="%TYPE% -a Cat="%4" -a Itel#0="%ITEL%" %5 %6 %7

Then I made a 

set TYPE=Tel
set ITEL=Tel.gif

and a 

elog_submit 123 a b CAT Test Message

ans all worked fine. Please change your ROptions to MOptions and try again.