we have plans to place a phone beside the main door for visitors to contact our colleagues.
can i make use of the call manager to create a intercomm system for visitors to call any internal numbers.
all my users are using 6921 IP phones and our call manager is version 9.
can i just place another 6921 outside the main door for visitors to dial the internal extension number without extra hardware ?
are there special phones model that are mean for intercomm system?