DTMF not working on BRI Trunk

I am using a SIP trunk from a ISDN BRI gateway and DTMF are not working in both incoming and outgoing calls.

Everything seems to be OK on the ISDN BRI gateway (unfortunately it is not good documented but I compared the configuration with another working installation) and I cannot understand if something is wrong on my FreePBX or on the BRI gateway.

dtmfmode is “rfc2833” on every trunks.

Could you help me please?

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