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Voice DSP module - expansion slot - refurbished
The VoIP capability enables a Cisco router to carry live voice traffic (for example, telephone calls and faxes) over an IP network. The VoIP card is available as a spare or a factory-installed card within the chassis. The VoIP card contains multiple digital signal processor (DSP) modules. It uses the Cisco AS5300's Quad or Octal T1/E1 Public Switched Telephone Network (PSTN) interface and local-area network (LAN) or wide-area network (WAN) routing capabilities to provide VoIP packetized voice traffic to or from T1/E1 time-division multiplexing (TDM) traffic. Model AS53-VOXD supports 96/120 channels. Major applications of the VoIP cards include toll bypass, remote PBX presence over WANs, unified voice/data trunking, and plain old telephone service (POTS) Internet phone gateway.
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