Device to accelerate a ringtone for landline phone

Odd ball question.  What are those devices call to increase a phone ringtone for the regular land-line phone?  When my parents are working in the yard they don't hear when I call and no they don't have a habit carrying cell phones in the pocket :-)  I know weird!
Please advice.
Thanks.
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Tiras25Asked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
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Tiras25Author Commented:
Thanks, Dave.
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Dave BaldwinFixer of ProblemsCommented:
You're welcome.
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