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I have an AT&T Merlin 820D2. There is 1 Line Board and 2 Station Boards installed. I haven't worked with these very much, would this be a considered a 4x20 system?

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Posted on Jan 02, 2017



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SOURCE: How do I set up voicemail in merlin 410 system?

MFurrer is right... the voicemail unit was made by Voysys. It is known by several names: Merlin Classic Mail, vp100, model 100.
Some telcomm suppliers who deal in used or refurb equipment MAY still have one or you can contact King Technologies (they own the rights to this unit). Either of these is likely to give you "sticker shock" ($1000+). Ebay is about the only cheap place to find one, but there are always buzzards circling over these (myself included). If you find one, make sure it includes the power supply. The units on ebay have several typical problems: bad hard drive, no power supply or deleted admin mailbox. All these should be deal-breakers unless you're planning on buying several for parts. The deleted Admin box is the only one that can't be discovered until the unit is attached to phone sys. It is fixable but the people who know how don't seem to want to share this knowledge.

Posted on Jul 20, 2009



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SOURCE: Number of Rings Before Call Goes To Voicemail

From the system programming menu either in the pc programming tool or from the console phone enter into system programming, options,more, group coverage delay. set here from 1 ring to 9. Good luck.

If this was helpful please send me a rating.
Thanks Dan

Posted on Aug 03, 2009

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How many lines does the at&t bis-10 phone have?

It depends on how the control unit is programmed. The BIS 10 can't be used as a stand-alone phone (as can't connect it directly to a telephone line).

The BIS 10 will work with the following systems:

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You should first start with converting the unit to run on 115 VAC if you can. We had a unit that went thru three ignitors, 2 selector boards, two main boards and a transformer in one summer in part because the electronics in that model are sensitive to spikes and spikes on a 230 circuit are worse than the same spikes would be wired for 115. Jandy was the source for that recommendation, not us.

Anyway, consider changing the line voltage and thoroughly inspect your main board to be certain it is not damaged. Assuming the main PCB is ok your best bet with a new part should be low voltage. Since we converted the unit we were working on it has been trouble-free.


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Will the AT&T Merlin BIS 10 Phone work on my home phone line? I work from home and love this phone, but need to know if it will work with a regular phone cord to the jack. Thanks!


The BIS 10 and related telephone units need to be connected to one of the following AT&T Merlin telephone systems:

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I can't turn on the ringer on my AT&T BIS-10 Merlin phone. My line blinks green when a call is incoming and I have to pick up and press the button in order to receive the call. I need the phone to...

Depends on what system you have that phone installed o.

If Merlin Legend, on the left side of the phone there is a 3 position switch. Its in the middle position now.

Slide that down
press on of your lines
Press *347

Slide the switch to the middle position.

If that doesnt work, we need to know the system you have these phones on.

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If you have a "squared" system (each line assigned to a different button), just press a different line button. To change the order of the lines, slide the "T/P" switch to "P" and press the line buttons in the order you want to use them (ie: Line 4, Line 3, Line 2, Line 1).

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Hope this helps.

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Blink codes are never good news and usually involve both power boards and the 2 sustain boards. Board swap jokeying practices dont fix it either as they need to be tuned and syncronised with special tools as well as assuring voltages are correct at each test point. I consider this a non DIY for those without tools knowledge or circuit diagrams. Those that have not heeded the warnings have ended up ruining their replacements as well as incurring extra costs that exceeded the cost of a professional.

10 times
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Please rate my help++++Thanks for using FIXYA

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