• SIP v2 (RFC 3261, 3262, 3263, 3264)
• SIP proxy redundancy-dynamic via DNS SRV, A records
• Reregistration with primary SIP proxy server
• SIP support in Network Address Translation (NAT) networks (including Serial Tunnel [STUN])
• Secure (encrypted) calling via prestandard implementation of Secure RTP
• Codec name assignment
• G.711 (a-law and µ-law)
• G.726 (16/24/32/40 kbps)
• G.729 A
• G.723.1 (6.3 kbps, 5.3 kbps)
• Dynamic payload
• Adjustable audio frames per packet
• Fax tone detection pass-through
• Fax pass-though (using G.711)
• Dual-tone multifrequency (DTMF): in-band and out-of-band (RFC 2833) (SIP info)
• Flexible dial plan support with interdigit timers and IP dialing
• Call progress tone generation
• Jitter buffer-adaptive
• Frame loss concealment
• Full-duplex audio
• Echo cancellation (G.165/G.168)
• Voice activity detection (VAD) with silence suppression
• Comfort noise generation (CNG)
• QoS (Ethernet port upstream bandwidth control, physical port, MAC address, application)
• Attenuation/gain adjustments
• Flash hook timer
• Message waiting indicator (MWI) tones
• Visual message waiting indicator (VMWI) via frequency shift keying (FSK)
• Polarity control
• Hook flash event signaling
• Caller ID generation (name and number)-Bellcore, DTMF, European Telecommunications Standards Institute (ETSI)
• Music on hold client
• Streaming audio server-up to 10 sessions
• System dial-on-demand routing (DDR) synchronous dynamic RAM (SDRAM)-16 MB
• System flash ROM-4 MB
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