20 Most Recent AT&T ATT Speakerphone CL2909 Questions & Answers

Phones show "in use" when the line voltage is low because another set is off-hook, which also happens when the line is unplugged. In other words, that is normal.

What happens when you do plug in the line? If it still shows in use then, the jack might be wired with reversed polarity. Try it elsewhere - someone else's house/office where the phones work "normally" to see what it does.

AT&T ATT... | Answered on Mar 09, 2019


AT&T ATT... | Answered on Aug 25, 2014


You could have a look at manual from :-


You need to have acrobat reader to view the file. The complete procedure how to change battery is given in that. Once you make sure that the battery is well seated, the next step would be to disconnect the power supply for few minutes, say 15 minutes and then turn it on. If the problem persists, then it is an internal problem.

Then, you could take a cleaning solution and make sure that the battery connectors are fine. Sometimes if the connectors are dirty or bent or damaged - it could cause the same issue. If the problem still persists, either you need to replace the set or open it for repair.When you open the unit, you might find a loose or damaged wire. Other than this, it has to be a faulty mainboard.Honestly, on most occasions repair is expensive as compared to cost of the new unit.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

AT&T ATT... | Answered on Jan 14, 2011

Is this just for your home or do your neighbours have the same problem? I hope I can help you further, a few more details would help me be able to help you.

Regards Jem

AT&T Lands... | Answered on Sep 22, 2019

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