Correct Answer: C
Explanation/Reference:
Explanation:
Unified CCX CTI ports are notified of caller-entered digits (DTMF input) via JTAPI messages from Unified CM. Unified CCX does not support any mechanism to detect in-band DTMF digits where DTMF digits are sent with voice packets. In deployments with voice gateways or SIP phones that only support in-band DTMF or are configured to use in-band DTMF, an MTP resource must be invoked by Unified CM to convert the in-band DTMF signaling so that Unified CM can notify Unified CCX of the caller-entered digits. Be sure to enable out-of-band DTMF signaling when configuring voice gateways in order to avoid using the previous MTP resources.
Reference: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