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IP Telephony Support—Features and Benefits
The Cisco 2800 Series allows network managers to provide scalable analog and digital telephony without investing in a one-time solution (refer to
Table 4 for more detail), allowing enterprises greater control of their converged telephony needs. Using the voice and fax modules, the Cisco 2800
Series can be deployed for applications ranging from voice-over-IP (VoIP) and voice-over-Frame Relay (VoFR) transport to robust, centralized
solutions using the Cisco Survivable Remote Site Telephony (SRST) solution or distributed call processing using Cisco Call Manager Express
(CME). The architecture is highly scalable with the ability to connect up to 12 T1/E1s trunks, 52 foreign-exchange-station (FXS) ports, or 36
foreign-exchange-office (FXO) ports.
Table 4. IP Telephony Support—Features and Benefits
Feature Benefit
IP Phone Support
• Optional support for Cisco in-line power distribution to Ethernet switch network modules and HWICs
can be used to power Cisco IP phones.
EVM Module Slots
• Extension Voice Module Slots, available only on the Cisco 2821 and Cisco 2851, provide support for
the Cisco High-Density Analog and Digital Extension Module for Voice and Fax, providing support for
up to 24 total voice and fax sessions without consuming a Network Module Slot.
PVDM (DSP) Slots on Motherboard
• DSP (PVDM2) modules deliver support for analog and digital voice, conferencing, transcoding, and
secure Real-Time Transport Protocol (RTP) applications.
Integrated Call Processing
• Cisco CME is an optional solution embedded in Cisco IOS Software that provides call processing for
Cisco IP phones. Cisco CME delivers telephony features similar to those that are commonly used by
business users to meet the requirements of the small to medium-sized offices.
Integrated Voice Mail
• Support for up to a 100 mailboxes using the Cisco Unity
®
Express voice messaging system is possible
with the integration of an optional voice-mail AIM or network module.
Broad Range of Voice Interfaces
• Interfaces for public switched telephone network (PSTN), private branch exchange (PBX), and key
system connections include FXS; FXO; analog direct inward dialing (DID); ear and mouth (E&M);
Centralized Automated Message Accounting (CAMA); ISDN Basic Rate Interface (BRI); and T1, E1,
and J1 with ISDN Primary Rate Interface (PRI); QSIG; E1 R2; and several additional channel-
associated-signaling (CAS) signaling schemes.
Survivable Remote Site Telephony
(SRST)
• Branch offices can take advantage of centralized call control while cost-effectively providing local
branch backup using SRST redundancy for IP telephony.
