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The Cisco 2900, 3900, and 4400 Series unified communications routers can help you immediately deploy an end-to-end unified communications network architecture or gradually shift voice traffic from traditional circuit-switched networks to a single infrastructure carrying data, voice, and video over packet networks.
Initially, you can use these unified communications routers to interconnect older PBXs over the packet infrastructure and still maintain PSTN (off-net) connectivity through your circuit-switched PBXs. Later, you can migrate PSTN (off-net) connectivity to the unified communications routers and start to incorporate IP phones at larger sites (Figure 1). After all sites are running IP telephony, you can begin deploying IP-based applications such as IP unified messaging, personal assistants, and extension mobility.
The unified communications routers are an ideal solution for circuit-switched PBX and PSTN access within a Cisco Unified Communications Manager-based IP telephony architec IP Telephony Phased Migration: Migrate Circuit-Switched PSTN and PBX Connectivity to Unified Communications
According to my experience and knoledge: the Cisco 2900 and 3900 series platforms have collaboration feature parity with the Cisco 2800 and 3800 Series platforms, so all of the following collaboration capabilities and solutions are present:
• Cisco Unified Survivable Remote Site Telephony (SRST)
• Cisco Unified Border Element
• Time-division multiplexing public-switched-telephone-network (TDM PSTN) and private-branch-exchange (PBX) gateways
• VoiceXML contact-center gateways
• Cisco Unified Communications Manager (UCM) media resources (allowing conferencing, transcoding, and Media Termination Point [MTP])
• Resource Reservation Protocol (RSVP) Agent
• Cisco Unified Communications Manager Express (CME)
• Cisco Unified SIP Proxy
• Gatekeeper
Cisco 3900 Series Routers
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