6xx Series IPPhone
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Escene Communication
Figure 2.2 Footstand of 6xx Series
5)
If you want to connect an ESM (Expansion module), you could connect it (any interface on the
ESM) to the EXT interface on the phone with a RJ-45 cable (a straight-through cable), and the
second ESM can be connected to the first one too. It supports 6 ESMs.