You could in theory have 2 expansion cabinets & stick a 32 card in both. If the main box was fully key coded you would
have 76 digital sets & 4 analog trunks. Not a very good setup as nobody would be able to call out or in most of the time.
Well.... with such setup you just setup VoIP Trunking with ITSP which provides SIP trunk without any REGISTER...like babyTEL... this the SIP key code are way too expensive...
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