ISDN Layer 3 (Q.931) Call Control

ISDN

Section: The OpenSS7 Project Devices (4)
Updated: Sat, 20 Dec 2008 14:25:11 GMT
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NAME

isdn, q931 - Integrated Services Digital Network (ISDN) Driver

SYNOPSIS

#include <ss7/cci.h>
#include <ss7/isdni.h>
#include <ss7/isdni_ioctl.h>

int isdn_stream = open(device, flag);

DESCRIPTION

ISDN
is an implementation of the Integrated Services Digital Network (ISDN) Layer 3 as defined in ITU-T Recommendation Q.931. ISDN provides call control of telephone calls over the ISDN. ISDN uses the services of the Q.921 Data Link (see dl(4)) or ISDN Q.931 User Adaptation Layer (see iua(4)) to transfer packets.

ISDN is implemented as a STREAMS(4) multiplexing driver. dl(4) or iua(4) streams are linked under the ISDN multiplexing driver using the I_LINK or I_PLINK commands of streamio(7), to provide data link services to ISDN. Once linked, the streams are configured using isdn_ioctl(4) IO controls. This function is normally performed by the ISDN Configuration Daemon, isdnconfd(8). See also, isdn(8).

ISDN provides the stream types listed below. To select a stream type, the device argument to the open(2) call can be selected from the following:

/dev/isdn: This device provides the ISDN protocol service interface using the CC-primitives of the Call Control Interface (CCI) described in cci(7), as interpreted for use with ISDN as described in cci_isdn(7). This interface is suitable for use with other SS7 modules and drivers, as well as with the cframe(3) library using the OpenSwitch call framework.

NOTICES

Unlike other SS7 protocol modules and drivers providing transport services, ISDN does not provide a sockets(3) interface. This is because the special needs of call control are divorced from the sockets paradigm.

IOCTLS

All interfaces support a set of management IO controls using ioctl(2) and I_STR commands to the streamio(7) system calls on the isdn_stream file descriptor. These management IO controls are documented in isdn_ioctl(4).

FILES

<ss7/cci.h>, <ss7/isdni.h>, <ss7/isdni_ioctl.h>, <ss7/cframe_isdn.h>.

DEVICES

/dev/isdn.

VERSIONS

The ISDN interface is specific to the OpenSS7 ISDN stack. This is Version 2 of the interface.

CCI interfaces are consisten with CCI Revision 0.8.2.

REFERENCES

[1]: ITU-T Recommendation Q.931, Digital Subscriber Signalling System No. 1 --- ISDN User-Network Interface Layer 3 Specification for Basic Call Control, March 1993, (Geneva), ITU, ITU-T Telecommunication Standardization Sector of ITU. (Previously "CCITT Recommendation") <http://www.itu.int/rec/T-REC-Q.931/>
[2]: ITU-T Recommendation Q.932, Digital Subscriber Signalling System No. 1 --- Generic Procedures for the Control of ISDN Supplementary Services, March 1993, (Geneva), ITU, ITU-T Telecommunication Standardization Sector of ITU. (Previously "CCITT Recommendation") <http://www.itu.int/rec/T-REC-Q.932/>

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IDENTIFICATION

The OpenSS7 Project: Package OpenSS7 version 0.9.2 released Sat, 20 Dec 2008 14:25:11 GMT.

This document was created by man2html, using the manual pages.
Time: 14:25:11 GMT, December 20, 2008