Chapter 9 Interconnecting VoIP Networks with a Cisco Unified Border Element
Two companies might use their own VoIP networks internally, and they might have frequent communication between one another. Instead of sending these intercompany calls over the public switched telephone network (PSTN), the call could remain a VoIP call end to end. To join together two VoIP call legs, however, you need an IP-to-IP gateway. The Cisco IP-to-IP gateway is known as the Cisco Unified Border Element (UBE). This chapter discusses the theory and configuration of Cisco UBE.
Cisco UBE Theory
A Cisco UBE is physically the same as a Cisco voice-enabled router. However, Cisco UBE has an IOS feature set with the unique capability to interconnect two VoIP call legs, ...
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