Which protocol is Cisco's proprietary endpoint control protocol?

Which protocol is Cisco's proprietary endpoint control protocol?

• A. SIP
• B. SCCP
• C. H.323
• D. MGCP

Answer: (B)

SCCP, the Skinny Client Control Protocol, is Cisco’s proprietary endpoint control protocol used between Cisco IP Phones and Cisco Unified Communications Manager. It’s designed specifically for Cisco endpoints to manage signaling, feature control, and status between the phone and the call-control server, making it Cisco-only in terms of its original implementation. In contrast, SIP is an open, industry-standard signaling protocol used broadly across many vendors, not restricted to Cisco. H.323 is an older ITU standard for VoIP signaling, and MGCP is a standard for controlling media gateways rather than end devices. Because SCCP is a Cisco-specific protocol focused on endpoint control, it is the correct choice.

SCCP, the Skinny Client Control Protocol, is Cisco’s proprietary endpoint control protocol used between Cisco IP Phones and Cisco Unified Communications Manager. It’s designed specifically for Cisco endpoints to manage signaling, feature control, and status between the phone and the call-control server, making it Cisco-only in terms of its original implementation. In contrast, SIP is an open, industry-standard signaling protocol used broadly across many vendors, not restricted to Cisco. H.323 is an older ITU standard for VoIP signaling, and MGCP is a standard for controlling media gateways rather than end devices. Because SCCP is a Cisco-specific protocol focused on endpoint control, it is the correct choice.