A voice over IP provides toll-free voice and fax communications over the Internet or Intranet.

Features:

• Up to 60 ports per chassis for communication over an existing IP network or the Internet
• Ethernet connectivity and full IP compatibility with existing routers and WAN infrastructure
• FXS/FXO, and E&M connectors on each channel for direct analog connection to phones, key telephones, PBX extensions, PSTN lines or PBX trunks (2-, 4-, and 8-port models only)
• Digital MultiVOIP connects directly to PBX or PSTN line via BRI, T1/E1 or PRI
• PSTN fail-over automatically routes calls over the PSTN network if the IP network is congested or down
• Supports H.323 or SIP for sending voice over the Internet
• Supports H.450 supplementary services to provide for call transfer, call forwarding, call hold, call waiting and name identification
• Voice compression to 5.3K per call with support for multiple algorithms, including ITU G.723 and G.729
• T.38 real-time fax relay for interoperability among other VOIP equipment
• Voice prioritization using the industry-standard Differentiated Services (DiffServ) protocol
• Configuration and management using a web browser or Windows