Troubleshooting guide

B-3
Cisco PGW 2200 Softswitch Release 9.8 Operations, Maintenance, and Troubleshooting Guide
OL-0800-14
Appendix B Troubleshooting Cisco ITP-L Signaling
Cisco ITP-L Signaling Overview
Backhaul Message IDs
There are five types of IP signaling backhaul message IDs:
• Backhaul reset commands
• Connection management commands
• Backhaul statistics messages
• Flow control
• Link status
Backhaul Reset
There are two types of IP signaling backhaul reset commands:
• SoftReset (Link reset)—Command is sent from the Cisco PGW 2200 Softswitch to the Cisco ITP-L
to put the backhaul signaling link in the Out-of-Service (OOS) state. If the command succeeds, the
Cisco ITP-L does not respond because the backhaul link is out of service. Sample message trace:
00:10:18: SoftResetRequest
• HardReset (CPU reset)—Command is sent from the Cisco PGW 2200 Softswitch to the Cisco ITP-L
to cause a CPU reset on the Cisco ITP-L. Sample message trace:
00:10:18: HardResetRequest
Connection Management
There are two IP signaling backhaul connection commands, a connection request and a disconnect
request. Each command has a corresponding confirmation message.
• Connection request—Command that is sent from the Cisco PGW 2200 Softswitch to the Cisco
ITP-L to request link alignment. The request indicates if the alignment is in a normal or emergency
state.
• Connection confirmation—Reply sent by the Cisco ITP-L to the Cisco PGW 2200 Softswitch in
response to a connection request. The reply indicates whether the connection request succeeded or
failed. Sample message trace:
4d10h: MTP2: rcvd Conn Req - Emergency ch=0 Statistics—
• Disconnect request—Cisco PGW 2200 Softswitch sends this command to the Cisco ITP-L to change
the status of an In-Service (IS) link to the status out of service (OOS). The request is always
processed.
The Cisco ITP-L transmits a status indicator, an Out-of-Service (OOS) message on the SS7 link.
• Disconnect confirmation—Reply sent by the Cisco ITP-L to the Cisco PGW 2200 Softswitch in
response to a disconnect request. The reply indicates whether the disconnect request succeeded or
failed.
• Disconnect indication—Cisco ITP-L sends this asynchronous message to the Cisco PGW 2200
Softswitch. The message indicates that the Cisco ITP-L detected a state change that calls for a
disconnect request command, such as link alignment lost. Sample message trace:
4d10h: MTP2: send Disc Ind ch=0 reason=0x7-LSSU condition