I'm still looking into whether these devices will
help me.  I'm at the
 point of figuring out what the unknown unknowns are, as I'm new to
 telephony.
 Where are you located?  I am in London, UK.  I'm aware that due to the
 likelihood of shipping there's a good chance this won't work out.
 
It's an older office phone system. Boxes that run a bunch of office
phones. Not a mobile phone.
Anyone know of an ESS-5A that needs a home? I really would like to bring
one to HOPE in NYC one year.
                - Ethan