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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the base unit.
Have you tried disconnecting the base unit from the telephone wall outlet for an extended period of time? ...and then try calling that phone/number using another phone or mobile? Then check if the line would be busy or ringing can be heard from the calling phone?