The Cisco 4321 Integrated Services Router (ISR) is a powerful platform that supports Unified Communications through Cisco Unified Communications Manager Express (CME), allowing businesses to deploy an integrated voice solution without needing separate server hardware. Configuring Call Manager (CME) on a Cisco 4321 involves enabling voice services, creating dial peers, configuring ePhones (IP phones), ePhone-dns (extensions), and setting up call routing through POTS or VoIP.
The configuration process includes:
Enabling voice service and telephony-service features
Defining phone types, numbers, and associated configurations
Creating SIP or H.323 trunking to interface with other networks or PSTN
Applying appropriate codec and region settings for voice quality
Setting up call handling features such as call forwarding, voicemail, and conferencing
The Cisco 4321 with CME is suitable for branch offices or small businesses, offering cost-effective and manageable IP telephony without requiring full Cisco Unified Communications Manager (CUCM) infrastructure.
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