What does xxx SIP call status mean?

Common SIP status error codes

If you are setting the callback parameter in your API requests or against your numbers for inbound calls, we will send the final SIP response of the call to your server via a callback.

Please see this Wikipedia article for complete documentation of standard SIP status codes, which Nexmo complies to.

Nexmo specific response codes

0 - Call timeout. The call was not answered within 30 seconds and Nexmo disconnected. This will only be received for Call API.
null - Call cancelled due to an error in the VoiceXML

Please contact us at support@nexmo.com if you see repeated occurrences of non user-related error codes.

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