Using a Yealink W56P DECT, we have 5 handsets. 3CX allows to assign one extension to each handset. However, the device actually allows to assign multiple extensions per handset. That's what we want: to be able to assign multiple extensions ("SIP Accounts") to a given handset in the DECT. For a multicompany kind of scenario it would allow to switch the CallerId when making outbound calls by selecting a "line" in the handset.