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Have you checked the phone's voicemail forwarding settings to be sure that you have not created a loop?
Yes. all settings are default.
Strange thing is this only happens when calls are forwarded from an outside (VOIP) carrier.
Calls forwarded from another Tmobile phone work correctly.
Strangely, My VOIP provider (NEXUMI) did not point fingers back to T-mobile (yet).
They think it might be a simple timeout issue - possibly t-mobile has lengthened time before voicemail picks up unanswered calls, or Nexumi has shortened the forwarded calls ring timeout.
I'll keep this updated.
BTW, both T-mobile techs (Reggie, then Kevin) promised to follow up at specific times but failed to call back.
This forces me to call in, hold, re-verify account, and explain the issue all over again.
Reggie failed to even make any notes so I had to start from scratch with Kevin, who wanted to dump all my bluetooth and Wifi connections.
The timeout for unanswered calls in user-controlled. Find the forwarding menu on your phone and look at detailed forwarding. You can set the number of seconds of delay on a Forward-No-Answer up to something like 45 seconds.
ooskie, what a doozy! This is clearly a provisioning issue and I'm not sure why our Tech team hasn't been able to get this taken care of for you. I can see where Kevin attempted to file a ticket but the ticket didn't have the required information in it so it was canceled. Unfortunately, the only way to get this handled is to work with your TEX team via 611 or our T-Force team on Facebook/Twitter may be able to file the ticket for you. It sounds like you've already spent a decent amount of time on the phone with us to get this fixed and if there were any other steps to get this fixed I would gladly let you know so you wouldn't have to call in again.