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continues to provide transport flexibility because IP can be routed across a multitude of WAN technologies (leased lines, Frame Relay, and ATM)

along with providing direct connectivity to the desktop.

Figure 2 shows an IP telephony application using Cisco CallManager Express and SRST in a business branch.

Figure 2. IP Telephony Application using Cisco CallManager Express and SRST in the Business Branch

The Cisco IP Communications voice/fax network modules support either one or two Cisco voice interface cards (VICs) or Cisco voice/WAN

interface cards (VWICs) and install into network module slots for the Cisco 2600XM Series, Cisco 2691, and Cisco 2800, 3600, 3700, and 3800

series voice gateway routers. The Cisco VICs are daughter cards that install into the network modules and provide the interface to the PSTN and to

telephony equipment (PBX, key systems, fax machines, phones). The Cisco VWICs are daughter cards that provide the interface to the PBX, PSTN,

and/or WAN.

VICs include 2-port foreign exchange station (FXS), direct inward dial (DID), foreign exchange office (FXO), and E&M analog interface cards.

Also available are 4-port FXS and 4-port FXO cards and a 2-port ISDN Basic Rate Interface (BRI) digital interface card providing –40V phantom

power. These cards cover the entire range of analog connectivity options along with user-side and network-side digital BRI connections (Table 1).

Cisco VWICs include 1- and 2-port T1 and E1 interface cards with optional drop-and-insert capability. These cards cover a full range of digital

voice and WAN connectivity options and provide connectivity to the world’s PBXs, PSTNs, and Post, Telephone, and Telegraph (PTT)

organizations.

Cisco IP Communications voice/fax network modules provide the gateway to Cisco AVVID for calls to and from the PSTN and the traditional

telephony equipment. Users can deploy networks that take advantage of investments in existing telephony equipment while also deploying and

integrating IP telephony immediately or in the future. These network modules enable users to operate at any point on the integrated voice, video,

and data infrastructure spectrum while incrementally adding connections to both traditional telephony and IP telephony.