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SCTP Stack Congested, Dropping/Retransmitting Outgoing Packet Diagnosis With Network Charging and Control Applications (OCNCC) (Doc ID 1268279.1)

Last updated on SEPTEMBER 19, 2017

Applies to:

Oracle Communications Network Charging and Control - Version 2.2.0 and later
Oracle Communications Convergent Charging Controller - Version 6.0.0 and later
Information in this document applies to any platform.
***Checked for relevance on 23-Dec-2013***

Purpose

This document will help in analyzing SCTP congestion/retransmission issues on Oracle Communication Network Charging and Control (OCNCC) software.  Some of the error messages reported during congestion are:-

PROD-UAS01 sua_if: [ID 953149 user.warning] sua_if(17914) WARNING: {401004} sctp:ITP01-SCTP1:15100:PROD-UAS01-UAS-SCTP1:14102: Congested; dropping outbound packet
PROD-UAS01 sua_if: [ID 439873 user.crit] sua_if(17914) CRITICAL =11 TcapTransaction.cc@1076: Failed to send TCTR N-UNITDATA message for TR-END
PROD-UAS01 sua_if: [ID 439873 user.crit] sua_if(17914) CRITICAL =11 TcapTransaction.cc@1047: Failed to send TCTR N-UNITDATA message for TR-CONTINUE
PROD-UAS01 sua_if: [ID 439873 user.crit] sua_if(17914) CRITICAL =11 TcapTransaction.cc@1015: Failed to send TCTR N-UNITDATA message for TR-BEGIN


This article will also explain SMSC timeout errors reported during congestion/retransmission

PROD-UAS01 xmsTrigger: [ID 953149 user.warning] xmsTrigger(18958) WARNING: Communications Error: Timed out while waiting for response from SMSC: MapTransaction (SMSC delivery) - MessageType=Submit(0), MapVersion=3, Segmented=false, A-party=00100164123456789, B-party=00100164987654321, Invoke-id=0, TCAP Dialog id=6713, Begin/Abort-Delta=<no abort received>, State=MT-awaitingSMSC


Please note that this article is written from the point of view of Oracle Communications Network Charging and Control (OCNCC) customers and hence does not cover all technical details of SCTP (Stream Control Transmission Protocol) and congestion/retransmission.  Please refer to RFCs and technical documents for further details.

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
 SCTP Connection
 SCTP Retransmission
 SCTP Congestion
 Congestion Errors:-
 Information Gathering
 Congestion/Retransmission analysis with Wireshark
 Wireshark TSN Analysis
 Retransmitted SCTP data packet without 'TSN Analysis'
 Retransmitted SCTP data packet with 'TSN Analysis'
 a_rwnd - Advertised Receiver Window Credit
 Plotting Graph
 OCNCC SCTP Statistics
 OCNCC - SCTP buffer value - configuration
 SCTP Congestion/Retransmission Examples
 Congestion when other end doesn't ACK SCTP data packets
 Configuration
 SCTP retransmission on single link (Max 3 attempts)
 Test Setup
 Test Configuration
 Test Analysis - Call Flow
 Retransmission detected in Wireshark using 'TSN Analysis'
 SMSC timeout during congestion/retransmission
 Abbrivations
References

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