The service node component of Cisco's voice architecture is realized by Cisco's open, programmable switch of the VCO. The VCO/4k is modular and scalable. It incorporates compatible generic software, universal network interfaces, and service resources and employs advanced technologies such as SS7, ISDN, hierarchical call control, and SNMP network management. In addition, the VCO/4k are Central Office (CO)-compliant, and you can deploy them in fully redundant or nonredundant environments.
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