The VoIP card is a coprocessing card and software package that adds VoIP capabilities. 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 T1/E1 Public Switched Telephone Network (PSTN) interface and local-area network (LAN) or wide-area network (WAN) routing capabilities to provide up to a 48/60 channel gateway for VoIP packetized voice traffic to/from T1/E1 time-division multiplexing (TDM) traffic.