Troubleshooting guide

B-1

Cisco PGW 2200 Softswitch Release 9.8 Operations, Maintenance, and Troubleshooting Guide

OL-0800-14

APPENDIX

Troubleshooting Cisco ITP-L Signaling

Revised: March 7, 2011, OL-0800-14

Cisco ITP-Ls function as signaling link interfaces to Signaling System 7 (SS7) Signal Transfer Point

(STP) mated pairs on the SS7 network side. On the network side, Cisco ITP-Ls function as IP interfaces

to the Cisco PGW 2200 Softswitches. Several different SS7 messages pass between the Cisco ITP-Ls

and STPs. Messages also pass through Cisco switches between the Cisco ITP-Ls and Cisco PGW 2200

Softswitches.

Each STP in a mated pair is active continuously under normal operating conditions. SS7 message traffic

normally flows between both STPs of the mated pair and the Cisco ITP-Ls, as shown in Figure B-1.

Figure B-1 Cisco ITP-L Hardware and I/O Signaling

This chapter includes the following sections:

• Cisco ITP-L Signaling Overview, page B-2

• Troubleshooting SS7 Link Problems, page B-5

• Troubleshooting Cisco ITP-L-to-STP Signaling Links, page B-11

• Troubleshooting Cisco ITP-L to Cisco PGW 2200 Softswitch Communications, page B-14

• Cisco ITP-L Error Messages, page B-17.

ITP-L-0

SP subsystem

Mated STP pair

V.35 10BaseT

100BaseT

26672

Switches

Cisco PGWs

ITP-L-1

ITP-L-2

ITP-L-3