CAPI and RVS-COM
Cisco700 Series Router Configuration Guide
6-2
CAPI and RVS-COM
The Cisco 700 series router supports the ISDN Device Control Protocol (I SDN-DCP) from
RVS-COM. ISDN-DCP allows a workstation on the LAN to use legacy dial computer
telephony integration (CTI ) applications. These applicat ions include fax transmitting and
receiving and placing and receiving phone calls.
Using ISDN-DCP, the router acts as a DCP server. By default, the router listens for DCP
messages on TCP port number 2578 (the Internet-assigned number for R VS - COM DCP)
on its LAN port.
When the router receives a DCP message from a DCP cli ent (c onnect ed to t he LAN port of
the router), the router processes the message and acts on it. The actions consist of sending
confirmations to the DCP clients and sending ISDN packe ts through the router BRI port.
When the router receives a packet on its BRI port for one of the DCP clients, the router
formats the packet as a DCP message and sends it to the corresponding clie nt. The router
supports all the DCP messages specified in the ISDN-DCP specification.
The router provides two 64-kbps Bchannels to CAPI clients. Each B channel can be
configured separately to work in either HDLC mode or bit-transparent mode. For CAPI
support, the higher layer protocols (B2 throughB7) are transparent to the applications
using these B channels.
The ISDN Core Engine of RVS-COM supports the following Bchannel protocols:
•CAPI layer B1
—64 kbps with HDLC framing
—64-kbps bit-transparent operation with byte framing from the network
—T.30 modem for fax group 3
—Modem with full negotiation
•CAPI layer B2
—X.75 SLP (ISO 7776) with V.42bis compression option (negotiated)
—V.120 with V.42bis compression option (negotiated)
—Transparent
—T.30 modem for fax group 3