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To Turn key tones on/off 26 .. To Set flash (Recall) time 26 .. To Set Dialling Mode (Tone/Pulse) 27 .. To Set Base to default settings 27 .. To Change the PIN code 28 Troubleshooting 29 Cleaning and Care 31 Declaration of Conformity 31 Guarantee and Service 32 Technical Details 33 Connection and conditions for use. You can connect your Concept Combo 2300 to a direct exchange line (DEL) - a line connected to a local exchange, with its own phone number; to an extension on an approved compatible P