B&E: When the Expressway is interworking a call between SIP and H.323, it also interworks the DTMF signaling, but only between RFC 2833 DTMF, and the H.245 user input indicators "dtmf" and "basicString".
Source: https://jerome.pro:8443/c/dam/en/us/td/docs/voice_ip_comm/expressway/admin_guide/Cisco-Expressway-Administrator-Guide-X12-5.pdf
Interworking DTMF signals
For SIP calls, the Expressway implements RFC 2833 for DTMF signaling in RTP payloads.
For H.323 calls, the Expressway implements H.245 UserInputIndication for DTMF signaling. dtmf is the only supported UserInputCapability. Expressway does not support any other H.245 user input capabilities (eg. basicString, generalString)
When the Expressway is interworking a call between SIP and H.323, it also interworks the DTMF signaling, but only between RFC 2833 DTMF, and the H.245 user input indicators “dtmf” and “basicString”.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X14-0-2/exwy_b_cisco-expressway-administrator-guide-x1402.pdf
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