Release Notes 1. Introduction
Version 2.6.3 7 November 2008
1 Introduction
The MP-20x is a 1 to 4 line (depending on model) Session Initiation Protocol (SIP) gateway, allowing
residential and small office / home office (SOHO) subscribers to connect ordinary “plain old telephone
service” (POTS) telephones or fax machines to the IP network. The MP-20x is interoperable with
leading softswitches and SIP Application Servers, offering legacy phone services such as caller ID, call
waiting, and call forwarding. In addition, the MP-20x includes an internal router with DHCP, NAT and
L2TP/PPTP/PPPoE capabilities, enabling subscribers to connect their home PC or LAN hub/switch to
the gateway.
Version 2.6.3 introduces a new MP-20x family member – the MP-203. MP-203 features two FXS lines
and an FXO line. When connected to the PSTN, the FXO line enables the user to make outgoing calls
to the PSTN and to receive incoming calls from the PSTN, in addition to the regular VoIP calls. The
MP-20x is suitable for users who wish to retain their PSTN line as a second line in addition to the VoIP
line.
Utilizing AudioCodes’ VoIPerfect™ core architecture, and gaining from its accumulated experience in
providing IP telephony solutions, the MP-20x series combines superior voice quality and state-of-the-art
features for end users, such as T.38 Fax Relay and G.168-2004-compliant Echo Cancellation. Low bit-
rate vocoders (voice coders) can be used simultaneously on both telephony ports to free valuable
bandwidth resources. The “Voice over Data” prioritization algorithm prevents degradation in voice
quality even during large data transfers.
The MP-20x series is designed for full interoperability with leading softswitches and SIP servers for
deployment in various network environments. Throughout the years, AudioCodes has invested
significant effort in establishing, and complying with, the leading and evolving VoIP standards. Support
of SIP, which is commonly found in Voice-over-Broadband (VoB) networks, assures seamless
integration and rapid deployment.
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