Troubleshooting guide

1-11
Cisco PGW 2200 Softswitch Release 9.8 Operations, Maintenance, and Troubleshooting Guide
OL-0800-14
Chapter 1 Cisco PGW 2200 Softswitch Platform Overview
Cisco PGW 2200 Softswitch Software Directory Structure
• linking the OCC and the terminating call control (TCC)
• updating and retrieving the call context structures
• interacting with other call engine components, such as the resource manager, connection
manager, and call manager
• managing bearer resources, such as trunking gateways
• using the MGCP
• keeping the call processing state machine.
– UCM also triggers events to be processed by the following MDL modules: generic analysis
module, subscriber profile retrieval, A-number and B-number pre-analysis, A-number and
B-number full analysis, route selection, and the IN trigger module.
• Connection plane manager (CPM)—Communicates with the call engine’s resource manager to make
the bearer connections to a remote trunking gateway using MGCP.
• CDR Manager—Generates CDRs and forwards them to the EMS to be locally persisted or
forwarded for off-platform accounting applications. CDRs are generated when calls are answered.
CDRs can be generated in the following situations also:
– End of call (standard)
– Long duration calls
– Mid-call CDRs (can generate CDBs at eight different points in a call)
• Terminating call control—Instance of the terminating protocol’s state machine.
• Call context—The following are the call context characteristics:
– Persistent object in a call instance that serves as the placeholder for bearer and signaling
information. Such information is set and retrieved by the OCC, TCC, or UCM at various points
in the life of the call.
– MDL context definition module is used to define the information elements, structures, and
fields. This module is compiled into an object file to be used by all protocols.
The format of these structures is protocol-independent to minimize cross-protocol conversion
permutations. Contains rules for data conversion to and from each protocol.
– Collects the following call information in CDBs, which are assembled to build CDRs: calling
number, called number, answer time, disconnect time, originating trunk group and circuit
identification code (CIC), terminating trunk group and CIC, address translation and route
information, ISUP information, ISDN service information, database query information, call
completion codes, and other information depending on the type of call.
Cisco PGW 2200 Softswitch Software Directory Structure
This section shows an overview of the UNIX file directory tree for the Cisco PGW 2200 Softswitch,
along with a brief description of the purpose for each directory. Use this section as a guide for finding
files called out in the operational procedures.
In the installation procedures, the installer is asked for a directory under which to install the Cisco PGW
2200 Softswitch software. The default directory is /opt/CiscoMGC; however, this directory name is
installer-definable. Therefore, do not assume that /opt/CiscoMGC is used always. This is the directory
under which nearly all files for the Cisco PGW 2200 Softswitch reside. Some temporary files that are
created at run time.