VOS3000 Call Termination Reasons: Complete Troubleshooting Reference Guide

Understanding VOS3000 call termination reasons is essential for maintaining a reliable VoIP operation. When calls fail or disconnect unexpectedly, the termination reason in the CDR (Call Detail Record) provides crucial information for diagnosis. This comprehensive reference guide covers all server-side termination reasons, client-side error codes, and provides actionable troubleshooting steps based on the official VOS3000 2.1.9.07 manual documentation.

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Table of ContentsVOS3000 Call Termination Reasons: Complete Troubleshooting Reference Guide Understanding Call Termination in VOS3000 Where to Find Termination Information (VOS3000 Call Termination Reasons) Server-Side Termination Reasons (VOS3000 Call Termination Reasons) Account-Related Termination Reasons (VOS3000 Call Termination Reasons) Routing-Related Termination Reasons Timeout-Related Termination Reasons Number Restriction Termination Reasons Forwarding-Related Termination Reasons (VOS3000 Call Termination Reasons) Protocol and System Termination Reasons (VOS3000 Call Termination Reasons) H.323 Device Error Codes (VOS3000 Call Termination Reasons) Common H.323 Cause Codes (VOS3000 Call Termination Reasons) SIP Error Codes Reference SIP 4xx Client Error Codes (VOS3000 Call Termination Reasons) SIP 5xx Server Error Codes SIP 6xx Global Failure Codes Using Call Analysis for Troubleshooting Call Analysis Tool Usage CDR Analysis for Pattern Detection Key Metrics to Monitor Related Resources (VOS3000 Call Termination Reasons) Frequently Asked QuestionsWhat is the most common call termination reason?How do I differentiate between timeout types?Why do I see “Insufficient Balance” for accounts with credit?What causes “No Matching Rate” errors?How do I troubleshoot intermittent “Session Timeout” errors? Get Expert Help with VOS3000 Troubleshooting Need Professional VOS3000 Setup Support?

Understanding Call Termination in VOS3000

Every call processed through VOS3000 generates a CDR record that includes the termination reason. This information is captured at the “Termination Reason” or “Call End Reason” field and indicates why the call ended. Understanding these reasons helps identify patterns, troubleshoot recurring issues, and optimize call success rates.

Where to Find Termination Information (VOS3000 Call Termination Reasons)

Navigation in VOS3000 Client:

1. Recent CDR
Location: Data Query → Recent CDR
Purpose: View recent call records with termination info

2. CDR Query
Location: Data Query → CDR
Purpose: Search historical CDR with filters

3. Call Analysis
Location: Operation Management → Business Analysis → Call Analysis
Purpose: Deep dive into specific call signaling

Key CDR Fields for Diagnosis:
┌──────────────────────────────────────────────────────────────┐
│ Field │ Information Provided │
├──────────────────────────────────────────────────────────────┤
│ Termination Reason │ Why the call ended (primary field) │
│ Session Time │ How long call lasted │
│ PDD │ Post dial delay │
│ Caller/Callee IP │ Endpoint addresses │
│ Codec │ Audio encoding used │
│ Setup Time │ When call started │
│ Connect Time │ When call was answered │
│ End Time │ When call terminated │
└──────────────────────────────────────────────────────────────┘

Server-Side Termination Reasons (VOS3000 Call Termination Reasons)

Server-side termination reasons are generated by VOS3000 itself when the softswitch decides to end or reject a call. These reasons indicate specific conditions that prevented call completion. (VOS3000 Call Termination Reasons)

Account-Related Termination Reasons (VOS3000 Call Termination Reasons)

Routing-Related Termination Reasons

Timeout-Related Termination Reasons

Number Restriction Termination Reasons

Forwarding-Related Termination Reasons (VOS3000 Call Termination Reasons)

Protocol and System Termination Reasons (VOS3000 Call Termination Reasons)

H.323 Device Error Codes (VOS3000 Call Termination Reasons)

When calls involve H.323 protocol, termination reasons may include standard H.323 cause codes. These codes follow ITU-T Q.931 recommendations and provide detailed information about call failures.

Common H.323 Cause Codes (VOS3000 Call Termination Reasons)

SIP Error Codes Reference

SIP responses follow standard HTTP-style status codes. Understanding these codes helps diagnose problems when they appear in CDR records or Call Analysis.

SIP 4xx Client Error Codes (VOS3000 Call Termination Reasons)

SIP 5xx Server Error Codes

SIP 6xx Global Failure Codes

Using Call Analysis for Troubleshooting

VOS3000 provides detailed call analysis tools that show the complete SIP/H.323 signaling flow, making it easier to diagnose complex problems.

Call Analysis Tool Usage

Enabling Call Tracing:

1. Go to System → Debug Trace
2. Enable tracing (check “On”)
3. Set trace length (default: 10 minutes)

Using Call Analysis:

1. Navigation → Data Query → CDR
2. Find the problematic call
3. Right-click → Call Analysis
4. View signaling flow:

Call Analysis Information:
┌──────────────────────────────────────────────────────────────┐
│ Column │ Information │
├──────────────────────────────────────────────────────────────┤
│ Serial Number │ Order of SIP messages │
│ Caller Signaling │ SIP messages from/to caller │
│ Callee Signaling │ SIP messages from/to callee │
│ Memo │ VOS3000 internal processing notes │
│ Time │ Timestamp of each message │
└──────────────────────────────────────────────────────────────┘

Export Options:
– Export: Save signaling as file
– Import: Load saved file for analysis

This helps identify:
– Where in call flow the failure occurred
– What SIP response code was returned
– Which side initiated termination
– Authentication challenges
– SDP negotiation issues

CDR Analysis for Pattern Detection

Regular CDR analysis helps identify recurring issues before they become major problems.

Key Metrics to Monitor

CDR Analysis Dashboard (Recommended):

1. ASR (Answer Seizure Ratio)
– Calculate per gateway, destination, account
– Alert threshold: Below 40%
– Indicates: Routing issues, capacity problems

2. ACD (Average Call Duration)
– Monitor for unusual patterns
– Very low ACD: Audio problems, wrong routes
– Very high ACD: Possible fraud

3. PDD (Post Dial Delay)
– High PDD indicates routing issues
– Alert threshold: Above 5 seconds

4. Termination Reason Distribution
– Track % of each termination reason
– Sudden changes indicate new problems

Sample Analysis SQL (for database queries):

SELECT
termination_reason,
COUNT(*) as count,
(COUNT(*) * 100.0 / (SELECT COUNT(*) FROM cdr_table)) as percentage
FROM cdr_table
WHERE start_time >= DATE_SUB(NOW(), INTERVAL 24 HOUR)
GROUP BY termination_reason
ORDER BY count DESC;

Related Resources (VOS3000 Call Termination Reasons)

VOS3000 Easy Troubleshooting Guide

VOS3000 FAQ Based on Official Manual

How to Stop Illegal Calls in VOS3000

VOS3000 Security and Hacking Prevention

VOS3000 Downloads

Frequently Asked Questions

What is the most common call termination reason?

The most common reasons are “Hang-Up by Caller” and “Hang-Up by Called” which are normal terminations. For abnormal terminations, “Response Timeout” and “Connection Timeout” are most frequent, usually caused by network issues, firewall problems, or endpoint misconfiguration.

How do I differentiate between timeout types?

Response Timeout occurs when the called party doesn’t answer (no 180 Ringing or 200 OK). Connection Timeout occurs when SIP messages don’t receive any response after retries. Proceeding Timeout occurs during call setup when 100 Trying is received but no further progress. Session Timeout happens during an established call when session timer updates fail.

Why do I see “Insufficient Balance” for accounts with credit?

This can occur when: the account has credit but the rate for the destination is higher than the balance, there’s a minimum balance requirement configured, or the account’s overdraft limit has been reached. Check rate tables and account settings in Account Management.

What causes “No Matching Rate” errors?

This occurs when a call is made to a destination prefix that doesn’t have a corresponding entry in the rate table. Check that rate prefixes cover all destination patterns. Remember that VOS3000 uses longest prefix matching, so ensure appropriate prefix entries exist.

How do I troubleshoot intermittent “Session Timeout” errors?

Session Timeout typically indicates NAT binding expiry or SIP Timer issues. Check NAT keep-alive settings (SS_SIP_NAT_KEEP_ALIVE_PERIOD), verify session timer configuration (SS_SIP_SESSION_TTL), and ensure the client supports SIP Session Timers. If the client doesn’t support timers, check SS_SIP_NO_TIMER_REINVITE_INTERVAL for the maximum call duration.

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