Which of the following clients is most likely to use CT…

Which of the following clients is most likely to use CTIQBE for signaling? (Select the best answer.)

A.
a Cisco IP phone communicating with CUPS

B.
a thirdparty IP phone communicating with CUPS

C.
a Cisco IP phone communicating with UCM

D.
a thirdparty IP phone communicating with UCM

Explanation:
Of the available choices, a Cisco IP phone communicating with Cisco Unified Presence (CUPS) is likely to use
Computer Telephony Integration Quick Buffer Encoding (CTIQBE) for signaling. The Cisco Computer
Telephony Integration (CTI) feature is a development system that enables programmers to create applications
that can connect to and communicate with a Cisco Unified Communications system. By using CTI,
programmers can create server software and desktop applications that interface directly with Cisco Unified
Communications Manager (UCM), CUPS, and other Cisco Voice over IP (VoIP) products.
UCM can use Session Initiation Protocol (SIP) on Transmission Control Protocol (TCP) port 5060 or User
Datagram Protocol (UDP) port 5060 for call signaling with a Cisco IP phone or a thirdparty IP phone. In
addition, UCM can use Skinny Client Control Protocol (SCCP) for call signaling with Cisco IP phones. The
signaling conversation between UCM and an IP phone controls many of the IP phone’s functions, such as call
initiation, call termination, and call waiting notification. UCM can have multiple, simultaneous signaling
conversations with IP phones using different protocols. For example, UCM can use SIP to communicate with
one IP phone and use SCCP to communicate with another IP phone on the same network. SCCP uses TCP
port 2000.
SIP is an Internet Engineering Task Force (IETF)standard call signaling protocol. Although SIP is typically used
as a peertopeer call signaling protocol, it can also operate in client/server mode. A softphone is software that
behaves like a phone, enabling a user to have voice conversations over a typical workstation network
connection. Softphone mode is an operational mode that Unified Personal Communicator uses to act as a
softphone.
SCCP is a Cisco-proprietary, client/server call signaling protocol. SCCP must be used with a Cisco call
processing platform, such as UCM, because SCCP is proprietary to Cisco. The firmware on Cisco IP phones is
configured to use SCCP by default. SCCP must be used on Cisco IP phones to enable the phones to use
Cisco’s full VoIP feature set. SIP is supported on Cisco IP phones with a firmware replacement.Reference:
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/im_presence/configAdminGuide/10_5_1/
CUP0_BK_CE43108E_00_config-admin-guide-imp-105/CUP0_BK_CE43108E_00_config-admin-guide-imp-
105_chapter_0101.html#CUP0_TK_V0703C9B_00
https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-presence-version-
70/113458-cups-integrate-cucm-00.html#ver-serv