Datasheet

Data Sheet

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

Figure 2. IP Telephony Application Using Cisco UCM Express and SRST in the Business Branch

The 2900 Series and 3900 Series Integrated Services Routers support Network Modules via an adapter (part

number SM-NM-ADPTR).

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 2800, 2900,

3800, and 3900 series unified communications 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 Unified Communications 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.