I can not change the old voice message recording or name on my alcatel 4020

This would depend on the type of voice mail you have. Normally, once you call into your mailbox you should have an option to change owner information, change recordings and such. Listen to the prompts given and select modify settings. The names of various items vary in different voice mail systems. You want to modify mailbox settings and name should be one of the options as well as changing recordings.

User manual http://www.cuhk.edu.hk/itsc/network/app/iptuc/doc/pabx/alcatel-4020-gen-user-eng.pdf

Just go into voice mail and press number 4, this then allows you to change greeting on the phone. Hope this helps

The only way to convert VM1 files to anything else is to use the Panasonic voice editing software. I have tried several other methods that claim to work but none of them have. The only way I was to do this was:
1.install a Windows XP operating system onto an old computer or get access to a Windows XP, Vista, or 2000.
2. I found an old Panasonic voice recorder off eBay that still had the software and purchased it (Panasonic RR-US470)
3. Installed the software
4. This is where it got tricky. The voice editing software doesn't recognize .vm1 files from other sources. The recorder and its software create its own file structure but if you put your own .vm1 files inside them, even with the same name, it still won't read it. Unless you do this.
A. Let's say you have 20 .vm1 files you want to convert you must first record 20 different voice recordings onto your voice recorder. These recordings can be like a second long.
B. Attach the voice recorder and move the new recordings to the folder using the software. The software will name the files MB001.vm1...MB002, etc. They will be hidden also.
C. Name your old files (the ones you want to convert to the same name as the 20 new recordings.)
D. Delete the new recordings from your computer and replace them with the files you want to convert. (the must have the same name).
E. Your software will now see the old files you want to convert. (On the software if you click outside the folder they are located and click back into it, you will now see the same files. It will still have the same duration as your new recordings but the file size will be bigger and you can listen to it and it will now be your old files.
F. Convert these to wave.

Once you get your .vm1 file converted smash your recorder and never use Panasonic ever again. There may be an easier way to do this, but I've tried many ways and nothing worked except this.

Can you please specify the exact model of the phone? Because the steps in accessing it remotely varies from model to model. Anyway, you can try to follow the steps posted here and then test:

Remote operation allows you to control the functions of the Answering System when you
are away from the Base,and call from an outside telephone line. The Answering
System cannot be accessed from another telephone on the same line. You can access
many of the Answering System functons from a remote location, such as listening to
messages, changing recorded announcements, and recording memos.
Remote operation can only be accessed from a touch tone telephone. If the remote phone
is set to pulse dialing, switch it tone. If tone dialing is not available, you will not be able
to access the Answering System.
Note: All function codes should be entered within 2 seconds in order to activate Remote
Operation.
To Activate Remote Operation From a Different Telephone Line
1. If the Answering System is OFF, you can dial your telephone number and wait for
the Answering System to answer your call after 10 rings. An announcement, "Please
enter your security code" is given, and you enter your security code to use remote
operation.
2. If the Answering System is ON, it will answer your call and begin playing the currently
selected announcement (as with any incoming call).
3. Enter # followed by your 2 digit security code during the announcement. The
default security code is 19.
4. Once the security code is received, a double confirmation beep will be given, and
you are in Remote Operation mode. You can then control the Answering Machine
functions using the telephone keypad.
5. The user can also enter the Remote Operation mode during message recording. The
procedure is the same as step 3. The recording will be stopped after entering the
valid security code "s#xx " and the incomplete message will be deleted. If " 0s"
is entered, the Answering System will release the line, but the recorded message
will still be retained.
6. If the user enters a wrong security code, the system will release the line.
Playing Messages Remotely
1. Press " #1 ", " #2 " or " #3 " on the touch tone keypad to play the messages in the
corresponding mailbox.
2. The system will announce "Mailbox X. You have XX new messages and XX old
messages" and the system will playback the new message only. If there are no new
messages, the system will announce "Mailbox X. You have XX old messages. On
the other hand, in the absence of old messages, the system will announce only the
number of new messages.
Repeat Messages During Playback
1. Press "#4" once during message playback to repeat the current message.
2. Press "#4" twice within 2 seconds to skip to the previous message.
Skip Messages During Playback
1. Press "#6" once to skip forward to the next message.
Stop Message Playback
1. Pressing "#5" during message playback will stop playback.
Deleting Messages
1. Press "#9" once during message playback to delete the current message.
Note: Playback will pause if "#" or " " is entered. Answering System will wait for the
command in the following 2 seconds. If no further tone is entered, playback will be resumed.
Memo Recording
1. Press " 8".
2. After selecting the mailbox by entering command "1", "2", "3", You will hear, "Now
recording", followed by a beep.
3. Enter "#5" to stop recording when you have finished.
Change OGM Remotely
1. Enter " 7" to record a new OGM. You will hear, "Now recording", followed by a
beep to signal start of recording.
2. Press "#5" to stop recording. Your new OGM will playback automatically.
Check OGM1 Remotely
Enter "#7" to review OGM. You will hear playback of OGM followed by a beep.
Turning Answering System ON or OFF
Pressing "#0" toggles the Answering System ON/OFF. "Answer machine on", or "Answer
machine off" will be announced, followed by a beep.
Voice Menu for Remote Operation
The system provides two pre-recorded voice menus to help you during remote operation.
Press " 5", and you will hear the simple voice menu.
The simple voice menu is as follows:
• Press "#1" to play mailbox 1.
• Press "#2" to play mailbox 2.
• Press "#3" to play mailbox 3.
• Press "#5" to stop.
• Press "#4" to repeat the message.
• Press "#6" to skip the message.
• Press "#9" to erase the message.
• Press " 5" for other functions.
(To advance voice menu)
The advanced voice menu is as follows:
• Press "#7" to review outgoing message.
• Press " 7" to record outgoing message.
• Press " 8" to record memo.
• Press "#4" twice to repeat previous message.
• Press "#0" to turn the system on or off.
• Press " 5" to return to the simple voice menu.
Pressing any function code will stop the voice menu, and perform the corresponding
functions.
Exiting Remote Operation
1. Enter " 0" on the touch tone keypad to exit remote operation mode. The Answering
System confirms your action with a long beep and then disconnects.
2. The Answering System also automatically disconnects if no key is pressed within 20
seconds during remote operation.

when your greeting answers, punch in your code, usually a 4 digit code, each manufacturer has their own default code that it comes with.. check the manual or website

yeah just call your voice mail and if you have att press 4 when asked then 3 and you can record new message

Press the 'erase' button until the word 'delete' appears. Then press AND HOLD the 'erase' button one more time until the 'delete' word dissappears. That should do it...
-Bill

The erase button is on the right hand side of the recorder. When you are on the message that you want to delete, then hold the erase button down. The message will start to play and an erase message will flash. Push the erase button down again and it will delete the message. Continue to do this for each message until you have the desireable amount of free space.

If your system is a Nortel Callpilot just log into your mailbox, then press 8, the first option "Record your name in the company directory" is what I think you're looking for.