Which statement describes DTMF processing on Cisco Unified Contact Center Express with
supported SIP-based agent IP phones that are registered to Cisco Unified Communications
Manager?

A.
Cisco Unified CCX receives the DTMF digits via SIP NOTIFY messages.

B.
Cisco Unified CCX receives the DTMF digits in the RTP payload based on RFC 2833.

C.
Cisco Unified CCX receives the DTMF digits via JTAPI messages.

D.
Cisco Unified CCX receives the DTMF digits via SIP INFO messages.

E.
Cisco Unified CCX receives the DTMF digits as part of the audio encoding in the RTP stream.

Explanation:
http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/crs/expr
ess_9_02/design/guide/UCCX_BK_C39FDB35_00_cisco-unified-contact-centerexpress_chapter_010.html