get into moc mode. (Trf, conf, *, Trf, conf, #)
CMD 9000 DE
xxxx,yy DE (where xxxx is the extension number, yy is the button number. also make sure you put the comma in, using the trf button)
F1090 execute.
the display should read
9000>xxxx,yy>f1090
then press execute and you will get
OK
Regards,
Dr VuDu