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Voice API

Do we retry if the voice event webhook fails?
Question Will the Voice API attempt to retry the event or the answer URL...
How do I verify that the Voice API Webhook request and it's payload has not been tampered during transit?
Objective Steps to verify that the Voice API Webhook request and its pay...
How To Check Call Quality With Voice Inspector
Objective Learn how to use Voice Inspector to diagnose call quality issu...
What is a Conversation ID?
Question What is a Conversation ID? Applies To Vonage Voice API SIP Web...
How to configure the custom webhook timeout for Voice API functionality and what are the allowed timeout ranges ?
Question How do I configure the custom webhook timeout for Voice API fun...
How do I change TTL for the Conversations and Call Legs?
Objective Configuring the Time to Live(TTL) for the conversation and cal...
Why are call progress events not being received on the Event URL defined in the conversation action NCCO?
Question Why are call progress events not being received for the convers...
Why is there an extended silence at the beginning of a call and how can it be reduced?
Question Why does it take a long time before my NCCO is executed? Why d...
Intermittent WebSocket Disconnections
Symptom Users experience intermittent WebSocket disconnections when util...
What Is An NCCO
Question What is an NCCO and how is it used in Vonage's Voice API? Appli...
How Does Jitter Impact Voice Calls
Jitter refers to the variability in the delay of received packets in a v...
Voice API "Bad Request" Error When Ending Calls Immediately After Creation
Symptom Users receive an error type: 'BAD_REQUEST', error_title: 'Bad Re...
What Is MOS In Voice Calls?
Question What Is MOS In Voice Calls? Applies To Voice API Answer The M...
Why do I see "SyntaxError: Unexpected token p in JSON at position 1" when creating JWT with the Vonage CLI?
Question Why do I see "SyntaxError: Unexpected token p in JSON at positi...
Is there a way to see current active calls on our account?
Question Is there a way to see current active calls on our account? Appl...
How To Make MP3 of Recording From Voice API in Python
Objective How To Make MP3 of Recording From Voice API Applies To Voice ...
How To Enter DTMF Before MP3 Stream Finishes
Applies To Voice API Procedure The bargeIn parameter in NCCOs controls...
Can a user call be removed from the voice call recording?
Question The conversation has 3 calls (agent, customer, and supervisor)....
What is a Call UUID?
Question What is a Call UUID?  Why is Vonage asking me for the Call UUID...
Are Manual Timeouts Possible Before NCCO Processing?
Question Can you force a call to ring for an x amount of time before pro...
Does the billing for a call include the time to detect an answering machine? 
Question Do I get charged for the seconds used for machine detection? Ap...
Is there an Additional Cost to record a Voice Call?
Question What is the pricing or cost to record a voice call?  Applies To...
5,000 Milliseconds Timeout on Connection HTTP-Outgoing Error in Log
Question Why do I get this error "5,000 milliseconds timeout on connecti...
How is Vonage Voice data used for AI training?
Question How is Vonage Voice data used for AI training? Applies To Voic...
Which order should Voice API callbacks be received?
Question Why do I receive Voice API event callbacks in the wrong order? ...
How long are call stored?
Question How long is the data for call stored? Applies To Calls Data Re...
What happens if the line is busy when receiving a Voice API call on PSTN endpoint?
Question What happens if the line is busy, engaged, or there is no answe...
Automated Speech Recognition Response Not Valid Term
Question Why is the Speech Input not recognized? Applies To Automated S...
Can I send fax over the Vonage Voice API?
Question Can I send Fax using Vonage's Voice API? Applies To Voice API ...
Can I call multiple recipients in one API request?
Question Can I make multiple calls at the same time with Voice API? Appl...