VOS3000 Call Failed Announcement: Easy IVR Voice Prompt Setup

VOS3000 Call Failed Announcement: Easy IVR Voice Prompt Setup

When a VoIP call fails, the default behavior in most softswitch systems is to simply disconnect the caller with a generic tone. This leaves callers confused about what went wrong and whether they should try again. The VOS3000 call failed announcement feature solves this problem by playing a specific IVR voice prompt to the caller when the called party is busy, unreachable, or the call fails for any other reason. Instead of a silent hangup, your callers hear a clear, professional message explaining exactly why their call did not connect — such as “the number you dialed is busy, please try again later” or “the number you dialed is currently unreachable.”

This feature is part of the VOS3000 IVR add-on module, which provides a suite of value-added services including IVR callback, voicemail, balance query, ringback tone, and the failed reason announcement covered in this guide. Configuring the call failed announcement is straightforward once you understand how the IVR module processes call failure events and maps SIP response codes to voice prompt files. For professional assistance with VOS3000 IVR configuration, contact us on WhatsApp at +8801911119966.

Table of ContentsVOS3000 Call Failed Announcement: Easy IVR Voice Prompt SetupWhat Is the VOS3000 IVR Add-On Module?How VOS3000 Call Failed Announcement WorksRelationship Between Call Failed Announcement and IVR CallbackSupported Failure Reasons for AnnouncementsSIP Response Code to Announcement MappingVoice Prompt File Format RequirementsRecording Custom Announcement Prompts (VOS3000 Call Failed Announcement)Configuring Call Failed Announcement in VOS3000 IVR ModuleEnabling the Failed Announcement Feature (VOS3000 Call Failed Announcement)Multi-Language Announcement Setup (VOS3000 Call Failed Announcement)Setting Up a New Language (VOS3000 Call Failed Announcement)Use Cases for VOS3000 Call Failed AnnouncementUse Case 1: Calling Card Platforms (VOS3000 Call Failed Announcement)Use Case 2: Retail VoIP ServicesUse Case 3: Contact CentersHow the Caller Hears the AnnouncementTesting Call Failed Announcements (VOS3000 Call Failed Announcement)How to Test with Different Failure ScenariosLimitations of Call Failed Announcement Related Resources (VOS3000 Call Failed Announcement)Frequently Asked Questions About VOS3000 Call Failed Announcement What is call failed announcement in VOS3000? How do I enable call failed announcements in VOS3000? What voice prompt format does VOS3000 IVR support? Can I customize the announcement for each failure type? Does call failed announcement work with all call types? How do I record custom announcement prompts for VOS3000? What is the VOS3000 IVR module? Need Professional VOS3000 Setup Support?

What Is the VOS3000 IVR Add-On Module?

The VOS3000 IVR module is an optional add-on package that extends the core softswitch functionality with interactive voice response capabilities. It is documented in the VOS3000 IVR Value-Added Services manual, specifically in Section 4 (Page 8) which covers the call failed announcement feature. The IVR module is designed to enhance the caller experience by providing voice-based interactions instead of silent call termination or generic tones.

The IVR add-on module includes the following features:

Feature Description Primary Use CaseIVR CallbackAllows callers to request a callback instead of waiting on holdHigh-traffic call centers, customer support queuesVoicemailRecords voice messages when the called party is unavailableEnterprise PBX, hosted voice servicesBalance QueryPlays the account balance to prepaid callers via IVRCalling card platforms, prepaid VoIP servicesRingback TonePlays custom audio instead of standard ring tone to callersMobile operators, branded voice servicesFailed Reason AnnouncementPlays voice prompt explaining why the call failedCalling card, retail VoIP, contact center platforms

Each feature in the IVR module operates independently, so you can enable only the call failed announcement without activating the other IVR services. This modular approach allows operators to deploy exactly the functionality they need without unnecessary complexity. For guidance on which IVR features best suit your business model, reach out on WhatsApp at +8801911119966.

How VOS3000 Call Failed Announcement Works

Understanding the technical flow of the call failed announcement is essential for proper configuration. When a call passes through the VOS3000 softswitch and the termination attempt results in a failure, the system normally sends a SIP error response back to the caller and disconnects the session. With the call failed announcement feature enabled, VOS3000 intercepts this failure event and instead of immediately disconnecting, it plays a pre-recorded voice prompt that corresponds to the specific failure reason.

The process works as follows:

Call setup attempt: The caller initiates a call through VOS3000, and the softswitch routes it to the appropriate termination gateway

Call failure detected: The termination gateway returns a SIP error response (such as 486 Busy, 408 Timeout, 503 Unavailable, or 404 Not Found)

IVR module intercepts failure: Instead of immediately forwarding the error response to the caller, the IVR module captures the failure event

Media proxy plays announcement: The VOS3000 media proxy plays the corresponding voice prompt file to the caller through the existing media channel

Call disconnect after announcement: After the announcement finishes playing, VOS3000 disconnects the call with the original SIP error response

This entire process happens within seconds and is completely transparent to the caller except for the helpful voice prompt they hear. The media proxy ensures that the announcement audio is delivered with proper quality before the call is torn down. For more details on how the media proxy handles audio, see our guide on VOS3000 media proxy mode configuration.

Relationship Between Call Failed Announcement and IVR Callback

The call failed announcement feature works closely with the IVR callback module. When both features are enabled, the call failed announcement can serve as a precursor to offering the caller a callback option. For example, after playing “the number you dialed is busy,” the IVR can then prompt “press 1 to request a callback when the line becomes available.” This combination provides a complete caller experience for failed calls, turning a negative interaction into a service opportunity.

However, the call failed announcement can also operate independently. If you only need failure announcements without the callback functionality, you can enable just the announcement feature. The two features share the same IVR infrastructure but are configured separately within the VOS3000 IVR module settings.

Supported Failure Reasons for Announcements

The VOS3000 call failed announcement feature does not trigger for every possible call failure. It only activates for specific SIP response codes that correspond to recognizable failure reasons. This is an important limitation to understand: not all call failures will produce an announcement. The feature is designed to cover the most common and caller-meaningful failure scenarios.

Failure Reason SIP Response Code Caller Experience Example AnnouncementBusy486 Busy HereCalled party is on another call“The number you dialed is busy, please try again later”No Answer408 Request TimeoutCalled party does not pick up“The number you dialed is not answering, please try again”Unreachable503 Service UnavailableCalled party network is down“The number you dialed is currently unreachable”Number Not Found404 Not FoundDialed number does not exist“The number you dialed does not exist, please check and retry”Temporarily Unavailable480 Temporarily UnavailableCalled party endpoint not registered“The subscriber you called is temporarily unavailable”Rejected603 DeclineCalled party rejected the call“The called party is not accepting calls at this time”Does Not Exist Anywhere604 Does Not Exist AnywhereNumber permanently invalid“The number you have dialed is not in service”

It is important to note that the call failed announcement only plays for these specific termination reasons. Other failure scenarios — such as routing failures, gateway capacity exhaustion, or account balance issues — may not trigger an announcement because they do not correspond to the defined SIP response codes that the IVR module monitors. For a deeper understanding of VOS3000 call end reasons, refer to our VOS3000 call end reasons guide.

SIP Response Code to Announcement Mapping

The VOS3000 IVR module maps each supported SIP response code to a specific voice prompt file. When the softswitch receives a failure response during call termination, it looks up the corresponding prompt file based on the SIP response code and plays it to the caller. This mapping is configured within the IVR module settings and can be customized to play different announcements for different failure types.

SIP Code SIP Reason Phrase Default Prompt File Announcement Type486Busy Herebusy.wavBusy announcement408Request Timeoutnoanswer.wavNo answer announcement503Service Unavailableunreachable.wavUnreachable announcement404Not Foundnotfound.wavNumber not found announcement480Temporarily Unavailabletempunavail.wavTemporary unavailable announcement603Declinerejected.wavCall rejected announcement604Does Not Exist Anywherenotexist.wavNumber does not exist announcement

You can replace the default prompt files with your own custom recordings, or you can configure the IVR module to use different file names for each failure type. The key requirement is that each prompt file must be in the correct audio format and placed in the appropriate directory on the VOS3000 server. For more information about SIP error codes and their meanings in VOS3000, see our guide on fixing VOS3000 SIP 503 and 408 errors.

Voice Prompt File Format Requirements

VOS3000 has strict requirements for the voice prompt files used by the IVR module. Using the wrong format will result in distorted audio, no audio, or the announcement failing to play entirely. Every voice prompt file uploaded to the VOS3000 IVR module must meet the following specifications.

Parameter Required Value Details Common MistakeFile FormatWAV (PCM)Uncompressed PCM WAV format; no MP3, OGG, or other compressed formatsUsing MP3 files — VOS3000 cannot decode compressed audio for IVR promptsSample Rate8000 Hz (8 kHz)Telephone quality sample rate; matches the G.711 codec used in VoIPUsing 44.1 kHz or 48 kHz CD-quality files — will cause distortion or no audioBit Depth16-bitStandard PCM bit depth for telephony audioUsing 8-bit or 24-bit files — will not play correctlyChannelsMono (1 channel)Single channel; stereo files are not supported for IVR promptsUsing stereo WAV files — the IVR module cannot process dual-channel audioFile Extension.wavMust use the .wav extension; case sensitivity depends on server OSNaming the file with .WAV or .mp3 extension

Recording Custom Announcement Prompts (VOS3000 Call Failed Announcement)

While VOS3000 includes default voice prompt files, most operators prefer to record custom announcements that match their brand voice and language. When recording custom prompts, follow these guidelines to ensure compatibility with the VOS3000 IVR module:

Use a professional recording environment: Record in a quiet room with minimal background noise and echo. Use a quality microphone connected to an audio interface rather than a computer’s built-in microphone.

Record at higher quality first: Record initially at 44.1 kHz/16-bit/stereo, then downconvert to 8 kHz/16-bit/mono using audio editing software like Audacity or Adobe Audition. This produces better results than recording directly at 8 kHz.

Keep announcements short: Aim for 3-10 seconds per prompt. Long announcements delay the call disconnect and consume more media proxy resources. Callers do not want to listen to a 30-second message explaining why their call failed.

Normalize audio levels: Ensure all prompt files have consistent volume levels. Use audio normalization to prevent some prompts from being too quiet and others too loud.

Remove silence at start and end: Trim any leading or trailing silence from the prompt file. Silence at the beginning delays the caller hearing the announcement, and silence at the end keeps the media channel open unnecessarily.

# Converting audio to VOS3000 IVR format using ffmpeg:
# Input: any audio format (mp3, wav, etc.)
# Output: 8kHz, 16-bit, mono WAV

ffmpeg -i input_recording.mp3
-ar 8000
-ac 1
-acodec pcm_s16le
busy.wav

# Batch convert all prompt files:
for file in *.mp3; do
ffmpeg -i “$file” -ar 8000 -ac 1 -acodec pcm_s16le “${file%.mp3}.wav”
done

# Verify file format using ffprobe:
ffprobe -show_format -show_streams busy.wav
# Expected output: sample_rate=8000, channels=1, codec_name=pcm_s16le

For help with recording and formatting custom IVR prompts, contact our team on WhatsApp at +8801911119966.

Configuring Call Failed Announcement in VOS3000 IVR Module

Setting up the call failed announcement requires configuring the IVR module settings in VOS3000 and ensuring that the voice prompt files are properly placed on the server. Follow these steps to enable and configure the feature. (VOS3000 Call Failed Announcement)

Step Action Details VOS3000 Location1Install IVR add-on moduleVerify the IVR module is installed and licensed on your VOS3000 serverOperation Management > System Management > License Info2Prepare voice prompt filesRecord or convert audio files to WAV format: 8 kHz, 16-bit, mono PCMAudio recording software (Audacity, ffmpeg)3Upload prompt files to serverCopy WAV files to the IVR prompt directory on the VOS3000 serverServer file system: /home/vos3000/ivr/prompts/ (or configured path)4Enable failed announcementEnable the call failed announcement feature in IVR module settingsOperation Management > IVR Management > Failed Announcement Settings5Map SIP codes to promptsConfigure which SIP response codes trigger which voice prompt filesIVR Management > Failed Announcement > Code Mapping6Set language preferencesConfigure language-specific prompt directories for multi-language supportIVR Management > Language Settings7Apply configurationSave and apply the IVR module configuration changesIVR Management > Apply Changes8Test announcementsPlace test calls that trigger each failure type and verify announcements playSoftphone / test endpoints

Enabling the Failed Announcement Feature (VOS3000 Call Failed Announcement)

The call failed announcement feature must be explicitly enabled in the VOS3000 IVR module settings. By default, this feature is disabled, and call failures result in normal call termination without any voice prompt. To enable it, navigate to the IVR management section in VOS3000 and locate the failed announcement settings. Toggle the feature to “Enabled” and specify which failure reasons should trigger announcements.

When enabling the feature, you must also ensure that the media proxy mode is properly configured. The call failed announcement relies on the media proxy to deliver the audio prompt to the caller before disconnecting. If your VOS3000 is configured in “bypass” or “relay” media mode where the media proxy does not handle the audio stream, the announcement cannot be played. Verify that your media proxy mode configuration supports IVR announcements. For help with media proxy settings, contact us on WhatsApp at +8801911119966.

Multi-Language Announcement Setup (VOS3000 Call Failed Announcement)

For operators serving diverse customer bases across different regions and languages, VOS3000 supports multi-language IVR announcements. This allows you to configure different voice prompt files for each language, and the system will play the appropriate announcement based on the caller’s language preference or the account’s configured language setting.

Language Prompt Directory Busy Prompt (486) No Answer Prompt (408) Unreachable Prompt (503)English/prompts/en/busy.wavnoanswer.wavunreachable.wavArabic/prompts/ar/busy.wavnoanswer.wavunreachable.wavSpanish/prompts/es/busy.wavnoanswer.wavunreachable.wavFrench/prompts/fr/busy.wavnoanswer.wavunreachable.wavChinese/prompts/zh/busy.wavnoanswer.wavunreachable.wav

Each language has its own directory containing the full set of prompt files with identical file names. The VOS3000 IVR module selects the appropriate directory based on the caller’s language preference, which is typically configured at the account level. When a call fails, the system looks for the corresponding prompt file in the caller’s language directory first, and falls back to the default language if the specific language prompt is not found.

Setting Up a New Language (VOS3000 Call Failed Announcement)

To add a new language for call failed announcements:

Create the language directory: Create a new directory under the IVR prompts path for the new language (e.g., /prompts/bn/ for Bengali)

Record prompts in the new language: Hire a professional voice artist or use text-to-speech to create WAV files in the target language

Convert to required format: Ensure all recordings meet the WAV, 8 kHz, 16-bit, mono specification

Copy prompt files: Place all prompt files in the new language directory using the same file names as the default language

Configure language mapping: Add the new language to the IVR module language settings and map it to the directory

Assign language to accounts: Update the language preference for accounts that should hear announcements in the new language

Test the new language: Place test calls from accounts with the new language setting and verify the correct prompts play

Setting up multi-language announcements requires careful coordination between the IVR module configuration and the account management settings. For assistance with multi-language IVR deployment, contact our team on WhatsApp at +8801911119966.

Use Cases for VOS3000 Call Failed Announcement

The call failed announcement feature adds value across multiple VoIP business models. Here are the most common use cases where this feature makes a significant difference in customer experience and operational efficiency.

Use Case 1: Calling Card Platforms (VOS3000 Call Failed Announcement)

Calling card platforms are one of the primary beneficiaries of the call failed announcement feature. When a calling card user dials a destination number, they have already invested time and effort into the calling card IVR flow (entering PIN, selecting language, dialing the number). If the call fails with a simple disconnect, the user has no idea what went wrong — was the number busy? Was it an invalid number? Did their balance run out? The call failed announcement solves this by playing a specific message like “the number you dialed is busy, please try again later” before disconnecting.

This is particularly important for calling card platforms because:

User retention: Callers who understand why their call failed are more likely to try again later, compared to those who experience a confusing silent disconnect

Reduced support calls: Clear failure announcements reduce the number of customer support inquiries about failed calls

Professional image: Custom branded announcements make the calling card service appear more professional and reliable

For calling card platforms, the announcement feature pairs well with the VOS3000 billing system to provide balance information alongside failure reasons.

Use Case 2: Retail VoIP Services

Retail VoIP operators who provide SIP trunking or hosted PBX services to businesses need to inform their customers’ callers why a call could not be completed. A business using retail VoIP does not want their customers’ callers to hear a generic disconnect when the business line is busy — they want a professional “the line is currently busy, please call back later” message. The VOS3000 call failed announcement provides this functionality, ensuring that every failed call results in a clear, informative message rather than a silent hangup.

Use Case 3: Contact Centers

Contact centers handle high volumes of outbound calls, and a significant percentage of these calls fail for various reasons (busy numbers, no answer, unreachable destinations). Without call failed announcements, agents waste time listening to generic tones or trying to interpret dead air. With the announcement feature, the agent (or the predictive dialer) immediately hears why the call failed, allowing them to disposition the call correctly and move on to the next attempt efficiently. Friendly failure messages also improve the experience when calls are transferred to external numbers that fail — the calling customer hears a clear explanation instead of being silently disconnected.

How the Caller Hears the Announcement

The technical mechanism by which the caller hears the failed announcement involves the VOS3000 media proxy. When a call fails and the IVR module determines that an announcement should be played, the following sequence occurs:

Call failure received: The VOS3000 softswitch receives a SIP error response from the termination gateway

IVR module evaluates failure: The IVR module checks whether the SIP response code matches a configured announcement trigger

Media channel maintained: Instead of immediately tearing down the media path, the VOS3000 media proxy keeps the RTP channel open toward the caller

Prompt file played: The media proxy reads the configured WAV prompt file and streams the audio content as RTP packets to the caller

Announcement completes: Once the prompt file finishes playing, the media proxy closes the media channel

Call disconnected: VOS3000 sends the original SIP error response to the caller and terminates the signaling session

This process relies on the media proxy being active in the call path. If the call is using media bypass mode where RTP flows directly between endpoints without passing through the VOS3000 server, the announcement cannot be played because there is no media proxy to inject the audio. This is why the media proxy mode configuration is critical for the call failed announcement feature.

Testing Call Failed Announcements (VOS3000 Call Failed Announcement)

After configuring the call failed announcement feature, thorough testing is essential to ensure that announcements play correctly for each failure scenario. Testing requires simulating different call failure types and verifying that the correct prompt plays with acceptable audio quality.

Test Case Test Method Expected Result Common IssueBusy announcement (486)Call a number that is currently on another callHear busy announcement prompt before disconnectNo announcement — feature not enabled or prompt file missingNo answer announcement (408)Call a number that does not answer within timeoutHear no answer announcement before disconnectAnnouncement plays but audio is distorted — check WAV formatUnreachable announcement (503)Call a number routed to a gateway that is offlineHear unreachable announcement before disconnectNo announcement — 503 may not be in the configured code listNot found announcement (404)Call an invalid or unallocated numberHear number not found announcementSilent disconnect — 404 not mapped to a prompt fileMulti-language testCall from accounts with different language settingsEach account hears announcement in configured languageWrong language plays — check account language mappingMedia bypass testTest with media bypass enabled on the accountNo announcement plays (expected — media bypass incompatible)Unexpected — if announcement plays, media proxy is still activeAudio quality testListen for clarity, volume, and distortionClear, professional audio at consistent volumeDistortion — verify 8 kHz/16-bit/mono formatCDR verificationCheck CDR records after test callsCorrect termination reason and call duration recordedIncorrect duration — announcement time may not be billed correctly

How to Test with Different Failure Scenarios

Testing each failure type requires creating conditions that produce the corresponding SIP response code. Here are practical methods for each scenario:

Busy (486): Call a registered SIP phone that is already on an active call. Most SIP phones return 486 when busy and call waiting is disabled.

No Answer (408): Call a registered SIP phone and let it ring without answering. The call will timeout with 408 after the configured ring timeout period.

Unreachable (503): Call a number whose routing gateway is offline or unreachable. Disable a routing gateway and attempt a call through it.

Not Found (404): Dial a number that does not match any route or registered extension in the VOS3000 system.

For each test, verify the CDR record shows the correct termination reason and that the caller heard the expected announcement. Document any discrepancies between the expected and actual behavior. If you encounter issues during testing, contact us on WhatsApp at +8801911119966 for troubleshooting assistance.

Limitations of Call Failed Announcement

While the VOS3000 call failed announcement is a valuable feature, it has important limitations that operators must understand before deployment:

Not all call failures trigger announcements: The announcement only plays for specific SIP response codes configured in the IVR module. Call failures caused by routing issues, gateway capacity limits, account balance problems, or internal softswitch errors do not trigger announcements because they may not produce the expected SIP error codes at the right point in the call flow.

Media proxy required: The feature requires the media proxy to be active in the call path. Calls using media bypass mode cannot receive announcements because the RTP stream does not pass through the VOS3000 server.

Announcement duration consumes resources: While the announcement is playing, the media proxy must maintain the RTP channel and process the audio stream. For high-volume systems with many simultaneous call failures, this additional media processing can impact server capacity.

No announcement for originating-side failures: The feature is designed for call failures that occur on the termination side. If the call fails before it reaches the termination gateway (for example, due to a client-side SIP error), the announcement may not trigger.

Fixed prompt per failure type: Each SIP response code maps to a single prompt file per language. You cannot play different announcements for the same failure type based on the called destination, time of day, or other conditions without additional customization.

Understanding these limitations helps you set realistic expectations for the feature and design your service accordingly. For more details on how call termination reasons work in VOS3000, see our guide on VOS3000 call termination reasons.

Related Resources (VOS3000 Call Failed Announcement)

VOS3000 Call End Reasons: Complete Guide for Operators

VOS3000 Call Termination Reasons Explained

VOS3000 Media Proxy Mode Configuration Guide

VOS3000 Billing System Configuration

Fix VOS3000 SIP 503 and 408 Errors

VOS3000 Downloads – Manual and Software

Frequently Asked Questions About VOS3000 Call Failed Announcement

What is call failed announcement in VOS3000?

The VOS3000 call failed announcement is an IVR feature that plays a pre-recorded voice prompt to callers when their call fails to connect. Instead of silently disconnecting the caller, VOS3000 plays a specific announcement explaining the failure reason — such as “the number you dialed is busy” for a 486 Busy response or “the number is currently unreachable” for a 503 Service Unavailable response. This feature is part of the VOS3000 IVR add-on module documented in Section 4 (Page 8) of the IVR Value-Added Services manual.

How do I enable call failed announcements in VOS3000?

To enable call failed announcements, first ensure the VOS3000 IVR add-on module is installed and licensed on your server. Then navigate to the IVR management section in VOS3000, locate the failed announcement settings, and enable the feature. You must also configure the SIP response code to prompt file mapping and ensure the voice prompt WAV files are placed in the correct directory on the server. Finally, verify that the media proxy is active for calls that should receive announcements. For step-by-step guidance, contact us on WhatsApp at +8801911119966.

What voice prompt format does VOS3000 IVR support?

VOS3000 IVR requires voice prompt files in WAV format with the following specifications: PCM (uncompressed) encoding, 8000 Hz (8 kHz) sample rate, 16-bit depth, and mono (single channel). This matches the G.711 telephony audio standard used in VoIP. Files in MP3, OGG, or other compressed formats are not supported. Stereo WAV files and files recorded at sample rates other than 8 kHz will produce distorted audio or fail to play entirely.

Can I customize the announcement for each failure type?

Yes, VOS3000 allows you to assign a different voice prompt file for each supported SIP response code. For example, you can have a “busy” prompt for 486 responses, a “no answer” prompt for 408 responses, and an “unreachable” prompt for 503 responses. Each prompt can be recorded with different content and in different languages. You can replace the default prompt files with your own custom recordings as long as they meet the WAV format requirements (8 kHz, 16-bit, mono).

Does call failed announcement work with all call types?

No, the call failed announcement has limitations. It only works for call failures that produce specific SIP response codes on the termination side. The feature requires the media proxy to be active in the call path — calls using media bypass mode cannot receive announcements. Additionally, internal failures such as routing errors, account balance issues, or gateway capacity exhaustion may not trigger announcements because they do not always produce the SIP error codes that the IVR module monitors.

How do I record custom announcement prompts for VOS3000?

Record your announcements in a professional environment using a quality microphone. Record initially at higher quality (44.1 kHz, 16-bit, stereo), then use audio editing software like Audacity or ffmpeg to convert the recording to VOS3000’s required format: 8 kHz sample rate, 16-bit depth, mono channel, PCM WAV format. Keep each announcement between 3-10 seconds, normalize the audio levels, and trim any leading or trailing silence. Upload the converted WAV files to the VOS3000 IVR prompt directory and map them to the corresponding SIP response codes.

What is the VOS3000 IVR module?

The VOS3000 IVR module is an optional add-on package that provides interactive voice response capabilities for the VOS3000 softswitch. It includes features such as IVR callback (allowing callers to request a callback), voicemail (recording messages for unavailable parties), balance query (announcing account balance to prepaid callers), ringback tone (playing custom audio instead of standard ring tones), and failed reason announcement (explaining why a call failed). The IVR module is documented in the VOS3000 IVR Value-Added Services manual and requires a separate license to activate.

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