Between which two DTMF relay methods does the Expressway support interworking? (Choose two.) 

Answer options:

A. unsolicited notify
B. RFC 2833
C. KPML
D. passthrough
E. H.245 user input indication

BE

Reference: https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/admin_guide/Cisco-Expressway-Administrator-Guide-X12-6.pdf