Cisco Call Manager - Cannot Transfer Call a 2nd Time if First Time Fails

We have a new issue on our phone system.  If we receive a call and try to transfer it to another internal number, but that person cannot take the call...if we go back to the original caller and try to transfer the call a 2nd time, transfer is not available.  This all of a sudden started happening.  We are on CM version 11.0.1.22900-14.  Thank you.
Thomas HoldrenSystem AdministratorAsked:
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Ken BooneNetwork ConsultantCommented:
So just to be sure what is happening.. When you attempt the transfer, the caller is put on hold.  Do you resume the original caller before you try the second transfer attempt?

What phone model are you using?
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Thomas HoldrenSystem AdministratorAuthor Commented:
Ken,

The user has a Cisco 7942G phone.  I just spoke with them and she told me that she hits the transfer button and checks with the person first, then goes back to the caller and when she tries to transfer t hem again, the transfer button is gone.  This is happening to a few people (and I'm assuming everyone).
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Ken BooneNetwork ConsultantCommented:
Ok so here are the steps I would go down..  first reboot the phone and see if the user can reproduce the problem.  If it still occurs, I would look at checking the firmware version.  Upgrade the firmware on those phones.  Check the softly templates to make sure the transfer button is on the correct states.
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Thomas HoldrenSystem AdministratorAuthor Commented:
the users rebooted their phones and the issue went away.  Could this have had something to do with something else on the system which just fixed itself?  Maybe too many lines in use at one time or something?
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Ken BooneNetwork ConsultantCommented:
Every now and then an odd quirk pops up on a phone. Doesn't happen very often though.  Can't explain why it might have happened in your situation.  Glad the reboot worked for you.  If it keeps occurring I would look into upgrading firmware on those specific phone models.
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