AudioCodes Gateway 4 Port FXS SIP Version 4 Analog Devices to IP Network Extended configuration with G.711, G. 723 + G.729 Codecs. The MediaPack™ product family are cost effective, cutting edge technology solutions.This stand-alone 4 Port FXS SIP Version 4 Analog provides superior voice-technology for connecting legacy telephony and PBX systems as well as integration with new IP-Based PBX architecture. This product is well suited for VoIP deployments and is designed to be fully interoperable with leading SoftSwitches, Gatekeepers, and SIP servers.