Refer to the exhibit.

Which DTMF relay method is advertised when the originating SIP gateway sends an INVITE message
with a Call-Info header shown?

A.
RFC 2833

B.
SIP INFO

C.
SIP NOTIFY

D.
SIP KPML

E.
In-band audio

Explanation:
You can develop user-specific applications that reside on your network entity and have the ability to
subscribe for event services supported by the IMG. If the network entity wants the ability to detect
an entered DTMF digit (only telephone event of “###” are currently supported) from the TDM-side
of a call to the IP side of a call, the entity can subscribe to the IMG for these events and receive SIP
NOTIFY events containing the digit event.