ISDN Layer 3 (Q.931) Call Control

ISDN

Section: OpenSS7 STREAMS ISDN Devices (4)
Updated: 2008-10-31
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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[1]. ISDN provides call control of telephone calls over the ISDN. ISDN uses the services of the Q.921 Data Link[2], dl(4), or ISDN Q.921 User Adaptation Layer[3], 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).

dl(4) and iua(4) Streams provide a Data Link Provider Interface (DLPI)[4], dlpi(7), service interface to the ISDN user. 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.

Note that the ISDN Q.921 User Adaptation Layer (IUA)[3], iua(4), is now provided by the sigtran(5) package.

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 consistent 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.921, Digital Subscriber Signalling System No. 1 --- ISDN User-Network Interface --- Data Link Layer Specification, March 1993, (Geneva), ITU, ITU-T Telecommunication Standardization Sector of ITU. (Previously "CCITT Recommendation") <http://www.itu.int/rec/T-REC-Q.921/>
[3]: RFC 4233, Integrated Services Digital Network (ISDN) Q.921-User Adaptation Layer, January 2006, Ken Morneault, ed., The Internet Society. (Obsoletes RFC 3057) <http://www.ietf.org/rfc/rfc4233.txt>
[4]: DLPI, Data Link Provider Interface (DLPI) Specification, Revision 2.0.0, Draft 2, August 20, 1991, (Parsippany, New Jersey), UNIX. International,Inc., UNIX International Press. <http://www.openss7.org/doc/dlpi.pdf>
[5]: 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/>

TRADEMARKS

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IDENTIFICATION

OpenSS7 STREAMS ISDN: Package strisdn version 0.9.2.4 released 2008-10-31.

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