T26P no audio on speaker phone

[luiz.guimaraes]

I have a T26P running 6.72.0.30, when a call is answered using the speaker phone, the caller cannot hear the person using the T26P. I've confirmed if the call is answered via handset and then put on speaker phone the call works. Also, we have no issues on the t26P running 2.72.0.30.

Does anyone ever come across an issue like this?

Thank you

Luiz