Datasheet

16
Release Notes for Cisco IOS Release 12.0(7)XV Feature Packs for the Cisco 800 Series
78-10446-01
Installation Notes
Figure 1 shows how CAPI connects applications, drivers, and controllers.
Figure 1 CAPI Connections
The framing protocols supported by CAPI include High-Level Data Link Control (HDLC), HDLC
inverted, bit transparent (speech), and V.110 synchronous/asynchronous. 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
• Point-to-Point Protocol (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
Controller 1
Application
Facsimile
Controller 2 Controller 3 Controller 4
26485
Application
Telephone
Common ISDN API (CAPI)
Application
File Transfer
Application
Other