Voice-over-IP (VoIP) Protocols

• SIP (RFC 2543)

• SCCP

Voice Codecs*

• G.729, G.729A, G.729AB2

• G.723.1

• G.711a-law

• G.711µ-law

Provisioning and Configuration

• DHCP (RFC 2131)

• Web configuration via built-in Web server

• Touch-tone telephone keypad configuration with voice prompt

• Basic boot provisioning (RFC 1350 TFTP Profiling)

• Dial plan provisioning

• Cisco Discovery Protocol for SCCP

Security

• RC4 encryption for TFTP configuration profiles

Dual-Tone Multi-Frequency (DTMF)

• DTMF tone detection and generation

Out-of-Band DTMF

• RFC 2833 AVT tones for SIP, MGCP, SCCP

Call Progress Tones

• Configurable for two sets of frequencies and single set of on/off cadence

Line-Echo Cancellation

• Echo canceller for each port

• 8 ms echo length

• Nonlinear echo suppression (ERL greater than 28 dB for f = 300 to 3400 Hz)

• Convergence time = 250 ms

• ERLE = 10 to 20 dB

• Double-talk detection

Voice Features

• Voice activity detection (VAD)

• Comfort noise generation (CNG)

• Dynamic jitter buffer (adaptive)

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