Skip to main content
No. of Recommendations: 0
From what I've been able to glean (no, I don't have one but I lurk on the Usenet newsgroup comp.dcom.telecom.tech) it emits the FIRST of the three tones in the not-in-service alert. To all callers, since there's no way to ID the calls that come in to tag them as telemarketers; if there were, then that would be what they'd use to identify the calls.

I have also heard that some new telemarketing stuff ignores the out of service tone and keeps you on the list, but this is just apocryphal.
Print the post  

Announcements

UGC Disclosure Notice Regarding Credit Card Posts
Community board discussions about credit cards are not provided or commissioned by banks who may have advertising relationships with The Motley Fool. Responses have not been reviewed, approved or otherwise endorsed by the bank advertiser. It is not the bank advertiser's responsibility to ensure all posts and/or questions are answered.
TMF Credit Center
The Motley Fool Credit Center arms you with real tools and simple messages, that will help you in every credit situation.
What was Your Dumbest Investment?
Share it with us -- and learn from others' stories of flubs.
When Life Gives You Lemons
We all have had hardships and made poor decisions. The important thing is how we respond and grow. Read the story of a Fool who started from nothing, and looks to gain everything.
Contact Us
Contact Customer Service and other Fool departments here.
Work for Fools?
Winner of the Washingtonian great places to work, and Glassdoor #1 Company to Work For 2015! Have access to all of TMF's online and email products for FREE, and be paid for your contributions to TMF! Click the link and start your Fool career.