To connect multiple modules, attach another Cable Connector between the AUX 2 
port on the rst Expansion Module and the AUX 1 port on the second Expansion 
module. You can connect a maximum of  three Expansion Modules to one phone. 
This device provides an easy transition from traditional PBX features and functionality 
into the world of  VoIP familiar paper directory cards and intuitive LED visualization 
that matches the VVX business media phones.