t26p don't transfer

[Malafaia]

Sorry for the delay and I couldn't get the files yet.

The phone that doesn't work was in my client and I tested it in my network and it works normally.
Is there any difference between t20p and t26p when they are going to transfer the call?
I put sip t28p to test in my client and it was working, but mow its not, do you think can be something in the network?

Thanks in advance.