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
* In simultaneous dual-port operation, the second port is limited to G.711 when using G.729.
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)
Fax**
• G.711 fax pass-through
• G.711 fax mode
