hy all... I've bought 4 spa901, and i want to configure these with this method: one telephone only receive (TELEPHONE A) and the other 3 (TELEPHONE B, C, D) only call A. the most important features is: whenever i raise up the phone, automatically it call the telephon A, whitout i press keys... it's possible??? i hope and i think yes!! plese help me! ps: now the telephones B, C, D just call A but if i press the number of telephone A!