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4 Check that the cradle on the handset is not blocked. • The telephone doesn't ring 4 Check that the ringer is not switched off (see ringer adjustment). 40 Temporis_10.qxp 14/11/2008 13:56 Page 41 • You cannot hear your correspondent 4 Check that another extension on the installation is not being used at the same time. 6. TECHNICAL SPECIFICATIONS • Telephone connection: Appliance designed for connection to an analogue telephone line class TRT3 (telecommunications network voltage) as defined by s