Voice

Country-Specific Features and Restrictions

• ★ Inbound Voice Features, Restrictions and Capacity
• Italy: Voice Features and Restrictions
• Argentina: Voice Features and Restrictions
• China: Voice Features and Restrictions
• Japan: Voice Features and Restrictions
• Mexico: Voice Features and Restrictions

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Voice Platform

• Why is my VoiceXML / Call or TTS API call failing?
• What IP addresses should I whitelist in order to receive voice traffic from Nexmo?
• Is WebRTC supported?
• What is Automatic Location Based Routing (ALBR)?
• What characters can Nexmo detect via keypad input?
• What is the maximum number of calls per second?

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Voice API

• What kind of pre-recorded audio files can I use with Voice API?
• When do you download my file when using Voice API?
• Can I transcribe my call?
• Can I call my Voice API application using SIP?
• How do I record a certain part of the call using Voice API?
• How do I retrieve my recording?

SIP

• Special Characters in Forward to SIP Address
• What does xxx SIP call status mean?
• Can I call Emergency Services (e.g. 911, 999, 112) using Nexmo? [E911]
• How can I connect a soft phone with Nexmo's SIP trunk to make outbound calls?

Text To Speech (TTS)

• When do you download my file when using TTS API?
• Does Nexmo cache pre-recorded audio files?
• How can I use TTS for non-supported Languages or Voices?
• What is the maximum number of TTS requests per second?
• What kind of pre-recorded audio files can I use in TTS? And how many audio files can be used?
• How does Machine Detection Parameter work?

(Deprecated) Call API

• How does Call API using VoiceXML work for outbound calls?
• Invalid destination error from Call API
• Do you send the results of a failed call to my status_url?