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We have enabled the High volume SMS feature for sandbox and production numbers .as the result standard SMS feature was not working anymore for messages, so we need to switch back to low volume SMS feature, we rise a ticket about this issue on this portal"https://developers.ringcentral.com/support/create-case", and now the case was closed, standard SMS feature is now working only for sandbox account in production has still issue

it shows errors like this

{

"errorCode" : "FeatureNotAvailable",

"message" : "Phone number doesn't belong to extension",

"errors" : [ {

"errorCode" : "MSG-304",

"message" : "Phone number doesn't belong to extension"

}

in production, is number switchback not working or any other issues

You need to check which user extension owns the phone number. Only that user extension can login your app and send SMS messages. The cause of the problem is clear in the error message "Phone number doesn't belong to extension"

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