AudioCodes 420HD - G Specifications

Administrator's Manual G. Specifications
Version 2.2.8 327 400HD Series IP Phones
G Specifications
The IP Phone specifications are listed in the table below.
Table G-1: IP Phone Specifications
Feature Details
VoIP Signaling Protocols
 SIP: RFC 3261, RFC 2327 (SDP)
Data Protocols
 IPv4, TCP, UDP, ICMP, ARP, DNS and DNS SRV for SIP Signaling
 SIP over TLS (SIPS)
 802.1p/Q for Traffic Priority and QoS
 VLAN Discovery Mechanism (CDP, LLDP and LLDP-MED)
 ToS (Type of Service) field, indicating desired QoS DHCP Client
 NTP Client
Media Processing
 Voice Coders: G.711, G.723.1, G.729A/B, G.722, and OPUS v1.1.
OPUS v1.1:

The encoder supports any sampling frequency up to 16 kHz

The encoder supports 10 ms to 120 ms packet time

The decoder can receive any stream (all modes, mono or stereo,
any sampling frequency 8 to 48 kHz)

The decoder can receive any packet time apart from 2.5 msec and
5 msec (in 'CELT only' mode only 20 msec packet time is
supported)

decoder performs up/downsampling and renders the signal as
wideband

Jitter Buffer size is 2 seconds

DTX is currently not supported by the encoder but is supported by
the decoder

One channel is supported so 3-way conference and MoH are not.
 Acoustic Echo Cancelation: G.168-2004 compliant, 64-msec tail
length
 Adaptive Jitter Buffer 300 msec
 Voice Activity Detection
 Comfort Noise Generation
 Packet Lost Concealment

RTP/RTCP Packetization (RFC 3550, RFC 3551), SRTP (RFC 3711)
 DTMF Relay (RFC 2833)
Telephony Features
 Call Hold / Un-Hold
 Call Transfer
 3-Way Conferencing (with local mixing)
 Redial
 Caller ID Notification
 Call Waiting Indication
 Message Waiting Indication (including MWI LED)
 Local and Corporate Directories
 Automatic On-hook Dialing
 Automatic Answering (Alert-Info header and 'talk' event)
 CWRR (Call Waiting Reminder Ring)
 Secondary Dial Tone
 Call Logs: Missed/Received Calls and Dialed Numbers