Hmm, Well there are issues with wireless handsets or headsets with certain versions of software and an upgrade to the latest version seems to fix the problem. Now, that being said the issue you are having doesn't seem to strike the same cord as the others in memory, but you never know when it comes to those things.
What you can do is have them stop using the cordless device on that phone by just removing it and putting on the corded handset and see if that resolves the issue for them. The issue with the cordless headset seems to be more of a bad battery on the device so it could never be paired, but then again it could just be bad in general.
If the problem follows the phone then obviously the issue is with the hardware and now you just need to determine whether it is the base phone itself or the cordless module and devices; my money is on the cordless module and devices being the culprit so just have them remove them and see if it persists.
Hopefully that gives you a little more confidence going in on further troubleshooting, but so far with the steps you have taken the problem is obviously a hardware one. I also hope that you left the corded handset that came with the phone so the user can remove the wireless portion and put on the corded one. If you have them remove the module and device don't forget to tell them about the strap inside the phone that will need to be removed.
Thanks for the reply,
the system is running v 6.0.10.88 (6.0 sp1, pr1 release 43) as part of a networked setup with 2 other mitel 5000's on the same software version. can I run mix software versions on the network? as I said earlier this site is 4 hours from me. do you think it is safe (and wise) to try to do a software update remotely? (I have access to a local PC onsite with the mitel tools so I can launch the upgrade from there)
do you recall what issue there were with the cordless devices?
the new phone was sold and dropped shipped by the telco, I only maintain the system. I have not laid my hands on this new phone. from what I can tell it was a bundle with the wireless module already installed. I don't even know if they got the wired handset with the new phone. I will verify and see if using a wired handset changes anything.
what bugs me, and maybe I should have used better terminology earlier, is that only call on analog trunk 1 (3891)have this issue. calls on analog trunk 2 (4581) are fine. if it is hardware, shouldn't the problem be the same answering either trunk?
as for the earpiece, I think that either the battery is defective, or the charge cradle is not properly connected. I am think the cradle. but I can not verify anything from remote
Paul