Solacom SS7, Quick Start Manual

Page: 18 / 66

Introduction
6
stack then communicates with Solacom’s SS7 SIL that resides on the same Solaris
processor.
MTP Level 3 routes messages based on the routing label in the signaling information
field (SIF) of message signal units. The routing label includes a Destination Point
Code (DPC), an Originating Point Code (OPC), and a Signaling Link Selection
(SLS). Point codes are numeric addresses that uniquely identify each signaling point
in the SS7 network. When the destination point code in a message indicates the
receiving signaling point, the message is distributed to the appropriate user part
indicated by the service indicator. The selection of the outgoing link is based on
information in the DPC and SLS.
ISUP information is carried in the Signaling Information Field (SIF) of a Message
Signal Unit (MSU). The SIF contains the routing label followed by a 14-bit (ANSI)
or 12-bit (ITU) circuit identification code (CIC), also known as the Interface ID in
the Solacom domain.
2.4 Solacom
’s SS7 SIL and VSOS
The SS7 SIL provides the interface between the SS7 stack and the EdgeIQ’s VSOS.
The SS7 SIL and SS7 stack run on the same processor whereas the VSOS can
operate on the same processor or on an external server. If VSOS is operating on an
external server, the SS7 SIL communicates with the VSOS over a TCP/IP
connection. The SS7 SIL receives SS7 maintenance and signaling messages from the
SS7 stack. The SS7 SIL forwards the SS7 messages to VSOS.
2.5 SSP and STP Support
The SS7 Solution supports Service Switching Point (SSP) services for its own
configuration but can be connected to a Signal Transfer Point (STP).
Connections are supported by a dedicated signaling link and cannot be used if bearer
channels are on the same link.
2.6 Bearer Channel Level Maintenance
The system supports maintenance at the span level only. All channel-level
maintenance messages to the stack are transferred with circuit group commands.