How Cisco IT in India Converged the VoIP and PSTN Infrastructure
Source: Cisco Systems
Limited call-center status and IN Exchange helped make communication more convenient for some Cisco employees, but did not resolve the basic and most obvious issue created by the restriction on PSTN and VoIP interconnection. Because PSTN and VoIP could not be interconnected, two network infrastructures were needed - essentially two of everything: two phones on every desk, two voice mailboxes for every employee, and two Cisco CallManager clusters. Achieving dual voicemail systems became the initial focus for integrating the two infrastructures. Messages left for employees on their VoIP line were stored in a Cisco Unity voicemail system, while PSTN line messages were stored in another brand of voice messaging system.