SIPPHONE -> Asterisk -> SIPPHONE DTMF (SIP INFO) Prob

I Try to send and dtmf from one phone over asterisk to another.
asterisk receives the sip info telegram and responds with ok.
but thats all. Asterisk doesn’t forward the sip-info message.
i changed the dtmfmode into all possible values but it didn’t help.

can anybody help me with this issue?

best regards

georg

im still trying to get the dtmf forwarded but i cant find any solution!