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IP Telephony Phased Migration

The Cisco 1861 and Cisco 2800, 3800, 2900, 3900, and 3900E 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 architecture.

Figure 1.

IP Telephony Phased Migration: Migrate Circuit-Switched PSTN and PBX Connectivity to Unified Communications

As companies seek to deploy unified communications solutions across the entire enterprise - converging voice,

video, and data across potentially thousands of sites - they require a solution that offers simple administration,

virtually unlimited scalability, and high availability. The unified communications routers work in concert with the

Cisco Unified Communications Manager, deployed in either a distributed or centralized call-processing model, to

provide the unified communications solutions that enterprises require.

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