Dial Configuration Guide, Cisco IOS Release 15.5M&T

Framing Protocols

The framing protocols supported by CAPI include High-Level Data Link Control (HDLC), HDLC inverted, bit transparent (speech), and V.110 synchronous/asynchronous.

Data Link and Network Layer Protocols

CAPI integrates the following data link and network layer protocols:

• Link Access Procedure on the D-channel (LAPD) in accordance with Q.921 for X.25 D-channel implementation
• PPP
• ISO 8208 (X.25 DTE-DTE)
• X.25 DCE, T.90NL, and T.30 (fax group 3)

CAPI Features

CAPI supports the following features:

• Basic call features, such as call setup and tear-down
• Multiple B channels for data and voice connections
• Multiple logical data link connections within a physical connection
• Selection of different services and protocols during connection setup and on answering incoming calls
• Transparent interface for protocols above Layer 3
• One or more BRIs as well as PRI on one or more Integrated Services Digital Network (ISDN) adapters
• Multiple applications
• Operating-systems-independent messages
• Operating-system-dependent exchange mechanism for optimum operating system integration
• Asynchronous event-driven mechanism, resulting in high throughput
• Well-defined mechanism for manufacturer-specific extensions
• Multiple supplementary services

Figure 2 shows the components of the RCAPI implementation.

Figure 2 Components of RCAPI

CAPI provides a standardized interface through which application programs can use ISDN drivers and controllers. One application can use one or more controllers. Several applications can share one or more controllers.

CAPI supplies a selection mechanism that supports applications that use protocols at different levels and standardized network access. An abstraction from different protocol variables is performed to provide this support. All connection-related data, such as connection state and display messages, is available to the applications at any time.

Supported B-Channel Protocols

The router provides two 64-kbps B channels to RCAPI clients. Each B channel can be configured separately to work in either HDLC mode or bit transparent mode. For CAPI support, layers B2 through B7 protocols are transparent to the applications using these B channels.

The ISDN Core Engine of RVS-COM supports the following B-channel 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

– V.120

– Transparent

– T.30 modem for fax group 3

– Modem with full negotiation

• CAPI layer B3

– Transparent

– T.90NL with compatibility to T.70NL according to T.90 Appendix II

– ISO 8208 (X.25 DTE-DTE) modulo 8 and windows size 2, no multiple logical connections

– T.30 for fax group 3

– Modem with full negotiation

• T.30 for fax group 3 (SFF file format [default], sending and receiving up to 14400 bit/s with ECM option, modulations V.17, V.21, V.27ter, V.29)
• Analog modem (sending and receiving up to 14,400 bit/s, modulations V.21, V.22, V.22bis, V.23, V.32, V.32bis)

Supported Switch Types

CAPI and RCAPI support is available only for the ISDN switch type Net3.

CAPI and RVS-COM

The router supports the ISDN Device Control Protocol (ISDN-DCP) from RVS-COM. ISDN-DCP allows a workstation on the LAN or router to use legacy dial computer telephony integration (CTI) applications. These applications include placing and receiving telephone calls and transmitting and receiving faxes.

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 RVS-COM DCP) on its LAN port.

When the router receives a DCP message from a DCP client (connected to the LAN port of the router), the router processes the message and acts on it; it can send confirmations to the DCP clients and ISDN packets through the BRI port of the router.

When the router receives packets destined for one of the DCP clients on its BRI port, the router formats the packet as a DCP message and sends it to the corresponding client. The router supports all the DCP messages specified in the ISDN-DCP specifications defined by RVS-COM.

Supported Applications

ISDN-DCP supports CAPI and non-CAPI applications. Applications are supported that use one or two B channels for data transfer, different HDLC-based protocols, Euro File transfer, or G4 fax; also supported are applications that send bit-transparent data such as A/Mu law audio, G3 fax, analog modem, or analog telephones.

Configuring RCAPI on the Cisco 800 Series Router

To configure RCAPI on the Cisco 800 series router, use the following commands beginning in global configuration mode:

Note If required, at each remote device console change to global configuration mode, using the command configure terminal, and repeat Step 2 through Step 7 to configure that device.

Monitoring and Maintaining RCAPI

To monitor and maintain RCAPI, use the following command in privileged EXEC mode:

Troubleshooting RCAPI

To test the RCAPI operation, use the following command in privileged EXEC mode

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