Cisco Unified Communications Manager (CUCM, or Unified CM) is the on-premises IP telephony call-processing platform that handles registration, call routing, and features. CLCOR's largest domain centers on CUCM call control.
Cisco Unified Communications Manager (CUCM, or Unified CM) is the on-premises IP telephony call-processing platform that handles registration, call routing, and features.
Session Initiation Protocol (SIP) is the signaling protocol that establishes, modifies, and tears down voice and video sessions.
A Dial Plan defines how CUCM routes calls using route patterns, partitions, calling search spaces, and translations.
A Voice Gateway connects the IP telephony network to the PSTN or legacy systems, converting between VoIP and TDM/analog.
A Session Border Controller (SBC), such as Cisco Unified Border Element (CUBE), secures and controls SIP trunk connections at the network edge.
Cisco Webex is the cloud collaboration suite for meetings, calling, and messaging that integrates with on-premises deployments in hybrid designs.
Webex Calling is Cisco's cloud-based phone system (UCaaS) that can replace or coexist with on-premises CUCM.
Cisco Expressway provides secure firewall traversal and mobile/remote access (MRA) so off-network endpoints can register to CUCM without a VPN.
Quality of Service (QoS) classifies, marks, and queues traffic so real-time voice and video get priority and low latency.
Differentiated Services Code Point (DSCP) is the marking in the IP header that signals a packet's QoS treatment, such as EF for voice.
Low Latency Queuing (LLQ) adds a strict-priority queue to CBWFQ so voice traffic is served ahead of other classes.
Real-time Transport Protocol (RTP) carries the actual voice and video media stream between endpoints, with SRTP adding encryption.
A Codec (such as G.
Mobile and Remote Access (MRA) lets Cisco endpoints register to CUCM securely from outside the corporate network through Expressway, without a VPN.
Media Resources are CUCM services such as conference bridges, transcoders, and MOH that manipulate or mix media streams.