working in the Hospitality industry for the last 11 years, I have seen mostly Mitel and Avaya. I have worked on the old Hitachi HCX series as well but they are really old.
if customer is looking for IP/VOIP systems then I have seen Mitel predominately cause of the features offered and believe it or not, at alot of high end and resort style properties, I have seen Cisco Callmanager with a 2nd software application that does the integration with the PMS and CAS systems. The call manager doesnt have a built in integration and requires this 3rd party software to communicate with these other sytems.
I have also see Asterisk and Freepbx for smaller properties that wanted that modern look to the telephone system.
Brian
To error is human.....if the machine doesnt work, then KICK IT !!!!!!!!!!!!!