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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.

The Cisco IP Phone 7945G is a two-line, color-display VoIP phone designed for professional business use, delivering high-definition audio, enhanced usability, and integration with Cisco Unified Communications.

The Cisco IP Phone 7821 is a cost-effective, two-line VoIP phone designed for small to mid-sized businesses, offering high-quality audio, essential call features, and secure, reliable communication.

The Cisco IP Phone 8851 is a high-performance, five-line VoIP phone with a large color display, HD audio, and integrated Bluetooth, designed for professional users in enterprise environments.

Cisco Unified IP Phone 7911G is a cost-effective, single-line VoIP phone designed for basic office use, featuring a backlit display, Ethernet switch, and support for Cisco Unified Communications solutions.