This article shows how the Cisco SPA8000 can connect with Cisco CallManager Express CCME & UC500 series (UC520, UC540 & UC560), to provide cheap alternative FXS Analog ports. Included are full instructions, commands, diagrams and necessary firmware upgrades.
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-voice/864-cisco-voice-uc500-ccme-spa8000.html
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