... port and can be connected with communication equipment such as computer, fax, etc. 7) Ring volume (Hi-Lo ... key-dialing Settings A. Number Settings: under the Pick-up handset or Speaker condition, press “ * ” for 4 ... protect guest privacy.3) Music on holdUnder pick-up condition,press “HOLD” key,telephone keep the ... and the caller already hung up, or this telephone didn't hung up,the PBX will send busy ...