SS7 over IP Design

The figure below provides a map to the interface specifications and componetns of the SS7 over IP stack. Click on an interface or a component to see the reference specification and design information related to the component or interface.

Interface Specifications

With the exception of the SDLI and SDTI (which are driver level interfaces for the SS7 Stack), the SIGTRAN stack uses the same set of interface specifications which are used by SS7 components in the OpenSS7 stack. This permits SIGTRAN UA components to be placed between SS7 stack components without the knowledge of either the upper or lower components. SS7 modules and application run as they would in a stand-alone SS7 stack.

Following is a table listing the pertinent SS7 level interfaces and the primary reference, specifications documentation and header files at each level:

Interface	Reference (PDF)	Specification Document		Manual Page	Header Files
SLI Signalling Link Interface	cdi-api.pdf	html	pdf	sli(7)	sli.h sli_ioctl.h
SLSI Signalling Link Set Interface	cdi-api.pdf	html	pdf	slsi(7)	slsi.h slsi_ioctl.h
MTPI Message Transfer Part Interface	npi.pdf	html	pdf	mtpi(7)	mtpi.h mtpi_ioctl.h
SCCPI Signalling Connection Control Part Interface	npi.pdf	html	pdf	sccpi(7)	sccpi.h sccpi_ioctl.h
TRI TCAP TR-User Interface	tpi.pdf	html	pdf	tcapi(7)	tri.h tri_ioctl.h
TCI TCAP TC-User Interface	tpi.pdf	html	pdf	tcapi(7)	tci.h tci_ioctl.h
ISUPI ISDN User Part Interface	cci.pdf	html	pdf	isupi(7)	isupi.h isupi_ioctl.h
BICCI BICC User Interface	cci.pdf	html	pdf	bicci(7)	bicci.h bicci_ioctl.h
CCI Call Control Interface	cci.pdf	html	cci.pdf	cci(7)	cci.h cci_isup.h cci_bicc.h
TPI Transport Provider Interface	tpi.pdf	html	tpi.pdf	tpi(7)	tpi.h tpi_mtp.h tpi_sccp.h tpi_tcap.h
XTI X/Open Transport Interface	pdf	html	pdf	xti(3)	xti.h xti_mtp.h xti_sccp.h xti_tcap.h
NPI Network Provider Interface	npi.pdf	html	npi.pdf	npi(7)	npi.h npi_mtp.h npi_sccp.h
XNS Sockets Interface	pdf	html	pdf	sockets(3)	socket.h mtp.h sccp.h tcap.h

SIGTRAN Stack Components

Component	Status	Reference	Interface Specs	Design Docs		Manual Page	Code	Test Results
M2UA SS7 MTP2-User Adaptation Layer	status	refs	sli(7)	html	pdf	m2ua(4)	code	html	pdf
M3UA SS7 MTP3-User Adaptation Layer	status	refs	mtpi(7) npi_mtp(7) tpi_mtp(7) xti_mtp(3) mtp_socket(7)	html	pdf	m3ua(4)	code	html	pdf
ISUA SS7 ISUP-User Adaptation Layer	status	refs	isupi(7) cci_isup(7)	html	pdf	isua(4)	code	html	pdf
BUA SS7 BICC-User Adaptation Layer	status	refs	bicci(7) cci_bicc(7)	html	pdf	bua(4)	code	html	pdf
SUA SS7 SCCP-User Adaptation Layer	status	refs	sccpi(7) npi_sccp(7) tpi_sccp(7) xti_sccp(3) sccp_socket(7)	html	pdf	sua(4)	code	html	pdf
TUA SS7 TCAP-User Adaptation Layer	status	refs	tcapi(7) tpi_tcap(7) xti_tcap(3) tcap_socket(7)	html	pdf	tua(4)	code	html	pdf

Note that the M2PA (SS7 MTP2-User Peer-to-peer Adataption Layer) is considered as a pseudo device driver. For more information on M2PA design see "SS7 Device Design."

TALI Components

Component	Status	Reference	Interface Specs	Design Docs		Manual Page	Code	Test Results
TALI Tekelec Adaptation Layer Interface	status	refs	mtpi(7) npi_mtp(7) tpi_mtp(7) xti_mtp(3) mtp_socket(7) sccpi(7) npi_sccp(7) tpi_sccp(7) xti_sccp(3) sccp_socket(7)	html	pdf	tali(4)	code	html	pdf