[Freeswitch-users] DTMF relay in 3-way call

Hello, I have the following scenario: Deskphone dials PSTN Destination A. Once answered, deskphone 3-ways a second PSTN Destination B. From that point, DTMF pressed by Destination A needs to be heard by B. Is there a simple way to have that DTMF relay over from A to B? Currently the 3-way is happening on the deskphone (Yealink T42). Is there perhaps a different way they should be connected? Thanks Mike