Messaging is inactive on all lines after push functions button and enter 981

This means the system can no longer communicate with the voice mail. You can try to locate the voice mail and power cycle the unit to resolve the issue, If you still get inactive feature after the reboot you will need to replace the vms.

That means that the voicemail system is no longer recognized by the phone system. Check the lights on the voicemail to see if its still receiving power.If so try unplugging and plugging the voicemail to reboot it. The voicemail can take up to 6 minutes to totally reboot.

First make sure u r using Voicemail system which is either Star talk or call pilot.
If u r any one of this then only u can use F 981, 982 , 983 or 985. Its a feature code of voice mail.
If u r using either of this and still gettin inactive feature, then try with rebooting The Satr talk or call pilot i.e. switch off from mains wait for few mins and switch it back on.
After rebooting it will take 15-20 mins to boot up the system and after that u can use these feature.

Thanks.
Abhi

Try powering off the voicemail system and and then power it on again. I've had it happen many times that after a power failure they just don't boot up correctly.

When you dial Feature 981 is there anything displayed on the set... something like Inactive?

Sounds like the Call Pilot is failing...

A. Turn on phone with full battery and non-T-Mobile SIM in place.
Allow phone to completely boot up to Wrong SIM screen. B. Enter from Wrong SIM Screen *#7465625# to confirm lock status C. Scroll through Interrogate Screen 1. Network lock - Active (this is the one you'll be deactivating)
2. Subset lock - inactive
3. SP lock - inactive
4. CP lock - inactive
5. SIM Card lock - inactive
6. Activa lock - inactive
7. Auto network lock - inactive
8. Auto subset lock - inactive
9. Auto SP lock - inactive
10. Auto CP lock - inactive
11. Auto SIM Card lock - inactive
12. Phone lock - inactive D. Push "C" button under navigation button to clear Interrogate screen back to Wrong SIM
screen E. From the Wrong SIM screen enter the following: *7465625*638*00000000*00000000# Those are two series of eight zeros. The phone will not show the zeros but will show dashes in their place. Phone may make a small tone and at the bottom of the screen it will read "Network Personalized" or perhaps "Network Already Personalized" F. Now input the following from whatever screen shows up: #7465625*638*00000000# (again this is a series of eight zeros) Phone may make small tone and will read "Network Lock Deactivated" G. Turn off phone
H. Re-start the handset and allow it to reboot.
J. Enter from Standby Screen *#7465625# to confirm lock removal status K. Scroll through Interrogate Screen 1. Network lock - inactive (note that this lock is now inactive)
2. Subset lock - inactive
3. SP lock - inactive
4. CP lock - inactive
5. SIM Card lock - inactive
6. Activa lock - inactive
7. Auto network lock - inactive
8. Auto subset lock - inactive
9. Auto SP lock - inactive
10. Auto CP lock - inactive
11. Auto SIM Card lock - inactive
12. Phone lock - inactive
That's it. Your phone is ready to accept SIM cards from just about any GSM mobile telephone service provider in the world. If you received a "wrong password" message you will need to insert a working SIM and reset the password to the default 8 zeroes "00000000". After that you may try this process again and it should work.

you could try this

By doing the reset (1st temp) you will lose all your
data ie contacts, messages, photos, videos etc etc so
back them up on your pc first.
Take out your sim card and follow the instructions below :
1st temp. put this number in the keypad
*2767*3855# let it reboot(restart)
now its ready for permanent.
Put in a sim card of a network that the phone won't
except and follow the instructions below.
( If you can't type anything with a locked sim
card inserted just take it out and do the next
step without a sim card in the phone)
Don't worry if your screen shows - - - - - - - when typing
it is supposed to do this.
Permanent.
ENTER :
*7465625*638*00000000*0000000
0#
NEXT ENTER
#7465625*638*00000000#
AND THEN *#7465625# to check the locks....all locks are
inactive...these are all the locks...
network lock - inactive
subset lock - inactive
sp lock - inactive
cp lock - inactive
sim lock - inactive
activa lock - inactive
phone lock - inactive
auto network - inactive
auto subset lock - inactive
auto sp lock - inactive
auto cp lock - inactive
auto sim lock - inactive
Enjoy !
This procedure does not change your imei number at all

How can I find out the extension Number of my phone set?

This generally happens from one of two things. Your voice mail system is connected to your phone system through a station port. If it loses connection it will not communicate with the phone system. Loose wire or connection can cause this. or it has just crashed and will need repair or replacement.

First thing you want to do is unplug the unit wait 15 minutes and plug it back in. wait 10 minutes Try feature 981 from a set that has voicemail. if nothing. hit feature 985 from a m7310 set or a m7324 set not a m7208. If it comes back with inactive fearture now your connection between the units is bad or the unit itself is bad. If it comes back with the voicemail intercom # and you cant get into any mailboxes it has lost all programming.Try this first.