AudioCodes 420HD - 1 Introduction; Overview of the 400 HD Series of IP Phones; Specifications

Release Notes 1. Introduction
Version 2.0.13B 7 400HD Series IP Phones for Skype for Business
1 Introduction
This document describes the new features, known constraints, and resolved constraints of AudioCodes'
400HD Series Skype for Business-compatible IP Phones for Version 2.0.13B.
Note: Microsoft has rebranded Lync as Skype for Business so when the term Skype for Business
appears in this document it also applies to Microsoft Lync.
1.1 Overview of the 400HD Series of IP Phones
AudioCodes' 400HD Series of Skype for Business-compatible IP phones offer enhanced voice quality
and clarity for users of Microsoft Unified Communications. The phones' wide range of essential business
features, reliability and certified interoperability make them the perfect choice for any Skype for
Business deployment, from small businesses up to large multi-site enterprises.
AudioCodes is a leading Microsoft partner with a complete offering of voice-enabling solutions for the
Microsoft Skype for Business Unified Communications market. In addition to IP phones, AudioCodes’
portfolio for Microsoft Skype for Business includes Media Gateways, Survivable Branch Appliances
(SBA), Enterprise Session Border Controllers (E-SBCs), and Call Recording.
1.2 Specifications
The table below summarizes the software specifications of AudioCodes 400HD series IP Phones for
Microsoft Skype for Business.
Table 1-1: Software Specifications of 400HD Series IP Phones for Microsoft Skype for Business
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)
 802.1x
 802.1p/Q for Traffic Priority and QoS
 VLAN Discovery Mechanism (CDP, LLDP)
 ToS (Type of Service) field, indicating desired QoS DHCP Client
 NTP Client
 Microsoft Skype for Business (previously Microsoft Lync)
 MS-ICE2
 Open SSL 1.0.1 integrated with TLS 1.2, compliant with Skype for
Business security requirements
 OVR (One Voice Resiliency)
Media Processing
 Voice Coders: G.711, G.723.1, G.729A/B, G.722.
 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)