Introducing VoIP Gateways (Introducing Voice over IP Networks) Part 3
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![Cisco CallManager System Guide, Release 4.1(3) - Understanding Cisco CallManager Voice Gateways [Cisco Unified Communications Manager (CallManager)] - Cisco Systems](https://www.cisco.com/en/US/i/000001-100000/90001-95000/91001-92000/91217.jpg "Cisco CallManager System Guide, Release 4.1(3) - Understanding Cisco CallManager Voice Gateways [Cisco Unified Communications Manager (CallManager)] - Cisco Systems")
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Cisco 2900, 3900, and 4000 Series Integrated Services Router Interoperability with Cisco Unified Communications Manager Data Sheet - Cisco
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Mapping Outbound VoIP Calls to Specific Digital Voice Ports - Cisco
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