Fax memory busy sharp mx-4501 - Sharp MX-2700N Color Copier

Try using the speaker button in the fax mode to dial out, that way you can hear what the operator is asking for. You might need to dial a 1, or you might need to enter a long distance code. It all depends on your phone system.

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Retry mode is something the machine will do if you're faxing to a number that is busy, or to a number that the fax cannot immediately connect to.
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Try an image memory clear.

On the control panel hit
P * C *
66 - then the black and white Start Button
10 - then the black and white Start Button
Execute on the screen, then yes. Allow it some time to do it's thing, then it should reboot. If it doesnt reboot after a minute or two, reboot it manually with the hard power switch in the bottom left corner of the front cover area near the toner. Skelton Business Equipment Houston Copiers

Network connection error.

Not really, you need the extra Ram installed into the copier & a fax module.

Address book and add new or user list and add new.

which model do you have. you have listed two different models in you post mx2300 is color MX260 is b/w.
Anyway the mm9 is a memory module for fax not a fax kit. The fax kit is a Fxx7 I think

Try exploring the device's web management interface.
Use your wenb browser to connect to the device's IP address.
the default credentials for the unit are user: admin pasword: admin
if that does not work, try password: Sharp (note that the S is capital and the rest are lower case)

Install the driver from the link below. then after install, just select the new fax as the printer and click print, it will pop open a window to enter the fax number and then click send.

http://www.sharpusa.com/products/business/copiers/business_copiers_drivers/

Select PC Fax Network Version. Download and install by running the setup.exe file.