telephone for hotel/hotel telephone/2 lines telephone for hotels/hotel bathroom telephone telephone for hotel1)battery free solution2)commercial grade high-quality speakerphone3)speakerphone works well with line power alone4)comple with all well known PBX brand:alcatel-LUCENT,Avaya,Ericsson,Mitel,Fujitsu,NEC,Nortel,Philips,Siemens...etc5)message waiting&incoming call indication6)handset volume ...