Cisco Call Manager on ISR 2951 enables integrated voice and IP telephony services using Cisco Unified Communications Manager Express (CME), offering reliable, scalable, and secure voice solutions for medium-sized branch offices.

Cisco 4321 router Call Manager configuration involves enabling Cisco Unified Communications Manager Express (CME) to support voice features such as IP telephony, call routing, voicemail, and SIP/H.323 trunking for small to medium-sized business environments.

Cisco 4221 Integrated Services Router (ISR 4221) is a compact, secure, and high-performance branch router offering modular connectivity, integrated security, and advanced services for small to mid-sized branch deployments.

Cisco CP-6921-C-K9 is a cost-effective, two-line VoIP phone designed for occasional-to-light voice communications, offering HD audio, a sleek design, and energy efficiency for business environments.

Cisco IP Phone 7965G is a high-performance, six-line VoIP phone featuring a full-color display, wideband audio, and advanced communication features, ideal for professional and executive users.

Cisco CP-7960 is a professional-grade, six-line IP phone offering robust VoIP capabilities, a large LCD display, and comprehensive feature support for enterprise communication needs.

Cisco CP-7942G is a feature-rich, two-line IP phone with a backlit display, wideband audio, and support for advanced VoIP features, ideal for mid-level office environments.