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 Account-Related Termination Reasons Routing-Related Termination Reasons Timeout-Related Termination Reasons (VOS3000 Call Termination Reasons) Number Restriction Termination Reasons Forwarding-Related Termination Reasons (VOS3000 Call Termination Reasons) Protocol and System Termination Reasons H.323 Device Error Codes Common H.323 Cause Codes SIP Error Codes Reference (VOS3000 Call Termination Reasons) 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 Call Termination Reasons) Call Analysis Tool Usage CDR Analysis for Pattern Detection (VOS3000 Call Termination Reasons) 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

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.

Account-Related Termination Reasons

Termination ReasonDescriptionSolutionAccount LockedThe account is currently disabled or lockedCheck Account Management → unlock accountAccount DisabledAccount status is disabledEnable account in Account ManagementAccount ExpiredAccount validity period has endedExtend expiry date or add paymentInsufficient BalanceAccount balance too low for callAdd credit to accountNo Matching AccountNo account found to bill the callCreate account or fix caller ID mapping

Routing-Related Termination Reasons

Termination ReasonDescriptionSolutionNo Matching RateNo rate found for the destination prefixAdd rate entry for the destinationThe Called Not OnlineNo appropriate device/gateway to accept callCheck gateway status, add routing gatewayConnection Limit ExceededMaximum concurrent calls reachedIncrease line limit on account/gatewayUnregisteredTerminal not registered and call not allowedCheck registration, verify device config

Timeout-Related Termination Reasons (VOS3000 Call Termination Reasons)

Termination ReasonDescriptionRelated ParameterResponse TimeoutCalled party did not answer before timeoutSS_TIMEOUT_PHONE_HANGUP, Alerting timerConnection TimeoutNo SIP response after max retriesSS_SIP_RESEND_INTERVAL, SS_SIP_SEND_RETRYProceeding TimeoutNo response within proceeding time limitSetup/Callproceeding timer in gatewaySession TimeoutSIP Timer update not received in timeSS_SIP_SESSION_TTL, SS_SIP_NO_TIMER_REINVITE_INTERVALConnection Establishment TimeoutConnection not established in timeMapping gateway proceeding timeout

Number Restriction Termination Reasons

Termination ReasonDescriptionSolutionCaller’s Number RestrictedCaller ID length exceeds allowed limitCheck SS_CALLERALLOWLENGTH settingCalled Number RestrictedCallee number length exceeds limitAdjust number length settingsCaller’s Number Prefix RestrictedCaller ID prefix not accepted by gatewayUpdate allowed prefixes in gatewayCalled Number Prefix RestrictedDestination prefix not acceptedCheck gateway prefix settingsCall RestrictionCall blocked by restrictions (e.g., International)Update account authorization settings

Forwarding-Related Termination Reasons (VOS3000 Call Termination Reasons)

Termination ReasonDescriptionConfigurationNo-Answer Forwarding by CallerCaller has no-answer forwarding enabledPhone Management → Call ForwardingNo-Answer Forwarding by CalledCalled party has no-answer forwardingCalled phone’s forwarding settingsTimed ForwardingCall matches time-based forwardingTime period forwarding configOn-Busy ForwardingCalled party busy, forwardedBusy forwarding configCall Forwarding by CalledUnconditional forwarding activeForwarding unconditional settingForwarding LoopForwarding creates infinite loopFix forwarding configurationDo-Not-Disturb from CalledCalled has DND enabledDisable DND or handle in routing

Protocol and System Termination Reasons

Termination ReasonDescriptionSolutionProtocol LimitServer cannot process this protocol typeCheck protocol compatibility settingsBusyCalled number is busyNormal termination, may retry laterForcible Hang-UpServer disconnected sessionCheck admin actions, system limitsHang-Up by CallerCaller ended the call normallyNormal terminationHang-Up by CalledCalled party ended the callNormal terminationSession Closed by CalledCalled closed TCP without hang-up signalCheck network/endpoint stabilitySession Closed by CallerCaller closed TCP without hang-upCheck caller network/device

H.323 Device Error Codes

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

Cause CodeNameMeaning1UnallocatedNumberNumber not assigned to any destination3NoRouteToDestinationNo route to the called number6ChannelUnacceptableChannel not acceptable for this call16NormalCallClearingCall cleared normally17UserBusyUser is busy18NoResponseNo response from user19NoAnswerUser alerted but did not answer21CallRejectedCall was rejected27DestinationOutOfOrderDestination cannot be reached28InvalidNumberFormatNumber format invalid34NoCircuitChannelAvailableNo channel available38NetworkOutOfOrderNetwork not functioning properly41TemporaryFailureTemporary network problem42CongestionNetwork congestion44RequestedCircuitNotAvailableRequested circuit not available47ResourceUnavailableInsufficient resources49QoSNotAvailableRequested QoS not available

SIP Error Codes Reference (VOS3000 Call Termination Reasons)

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)

CodeNameMeaning400Bad RequestMalformed SIP message401UnauthorizedAuthentication required403ForbiddenRequest understood but refused404Not FoundUser not found405Method Not AllowedSIP method not allowed406Not AcceptableCannot produce acceptable response407Proxy Authentication RequiredProxy authentication needed408Request TimeoutServer could not respond timely410GoneResource no longer exists415Unsupported Media TypeMedia format not supported422Session Interval Too SmallSession timer too short423Interval Too BriefRegistration interval too short480Temporarily UnavailableCallee temporarily unavailable481Call Leg/Transaction Does Not ExistMatching transaction not found482Loop DetectedSIP loop detected483Too Many HopsMax-Forwards exceeded484Address IncompleteNumber incomplete485AmbiguousAmbiguous destination486Busy HereCallee is busy487Request TerminatedRequest cancelled488Not Acceptable HereSDP not acceptable491Request PendingRequest pending for same call493UndecipherableCannot decrypt request

SIP 5xx Server Error Codes

CodeNameMeaning500Server Internal ErrorUnexpected server error501Not ImplementedFunction not implemented502Bad GatewayInvalid response from upstream503Service UnavailableService temporarily unavailable504Server Time-outNo response from upstream505Version Not SupportedSIP version not supported513Message Too LargeMessage exceeds size limit

SIP 6xx Global Failure Codes

CodeNameMeaning600Busy EverywhereAll destinations busy603DeclineCall declined everywhere604Does Not Exist AnywhereUser does not exist606Not AcceptableSession cannot be established

Using Call Analysis for Troubleshooting (VOS3000 Call Termination Reasons)

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

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 (VOS3000 Call Termination Reasons)

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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