telephone for hotel/hotel telephone/2 lines telephone for hotels/hotel bathroom telephone telephone for hotel1)battery free solution2)commercial grade high ... alcatel-LUCENT,Avaya,Ericsson,Mitel,Fujitsu,NEC,Nortel,Philips,Siemens...etc5)message waiting&incoming call indication6)handset volume ... adjustable:816)on-hook delay 1.2 second for PABX to prevent ring back17)desk/wall mountable18)colors ...