SCCP phones are not able to produce RFC 2833, they transmit it via SCCP messages to CUCM, so you need to put there something which will add RFC2833 to ordinary RTP stream -> you add MTP to RTP path, which will do the job
Almost all phones, SCCP or otherwise, support RFC2833 at this point. Only 7940/7960 other gen one models that have not had firmware updates in years didn't get this capability added. The phone will send SCCP OoB or KPML if it's a SIP endpoint to CUCM in case interop is needed through an MTP; however, it will also send RFC2833 to the trunk if instructed to do so. You'll probably want to confirm that RFC2833 gets negotiated in the SDP of the call on the trunk. Once that is confirmed a few debugs on CUBE (or whatever your SBC is) would tell you whether the phone is actually sending the digits. If it was negotiated with CUCM and CUBE never gets the packets it's likely a phone firmware defect. You could upgrade the firmware and if that doesn't fix it open a TAC case.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.