Lines 1 & 3 won't break dialtone on Merlin 410

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

The BIS 10 will work with the following systems:

AT&T Merlin 206
AT&T Merlin 410
AT&T Merlin 820
AT&T Merlin 820D2
AT&T Merlin 1030
AT&T Merlin 3070
AT&T Merlin II (with the proper modules installed)
AT&T Merlin Legend (with the proper modules installed)

Like Windows XP with other service pack 1-3

Windows 7 OS had service pack 2 also that update all of the driver. This will fix the microphone problem. Just download and install the service pack2 (updated driver).

No.

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

AT&T Merlin 206
AT&T Merlin 410
AT&T Merlin 820
AT&T Merlin 820D2
AT&T Merlin 1030
AT&T Merlin 3070
AT&T Merlin II (With the proper modules installed)
AT&T Merlin Legend (With the proper modules installed)

Sounds like one (or more) of your lines are out in your telephone system. Each time you press a 9 for a line the system simulates a dialtone to see what your dialing next so it can check it against the automatic route selection table. After it checks, it pulls a line out of a pool group to complete the call. At this point its grabbing a line that is not working on the system.The best way to figure out which ones arent working is to check the lines on the main console by pressing each line button and seeing if it produces dialtone. More than likely(but not allways) its going to be a line problem from your dialtone provider.

You might take an electronic device and plug it into the outlet where the Merlin was plugged in. I doubt it , but it could be a power outlet failure. other then that Merlin 410's can still be purchaced on the refurbished market.

That system is 2o years old (give or take) It might be time to look at a new system.

At the phone slide the T/P switch to "P"

Press ** (star,star)
press the linjes in the order you want to pick them up.
Press ** (star,star)
Slide T/P switch to "T"

Deregistered 4 handsets, on suggestion from FixYa, by pressing hangup & # sign.
Then reregistered to base.

That system does support voicemail, but they havent made the voicemail for about 15 years. The only voicemail that will work on it is "Voysys"

Microsoft releases updates to Windows on a regular basis. That is what "Windows Update" is doing. These are patches to fix bugs, or vulnerabilities in the OS.

Occasionally, MS releases a major update to the OS. This update may add new features, or be a rewrite of an important component of the OS. These updates are called "Service Packs", and they are numbered.

The current version of XP is Service Pack 3, and if you haven't installed the update, it's a good idea for you to do so. The same for Win 2003 Service Pack 2.

ANY Windows machine you have should have the automatic updates turned on, to keep your system up to date.