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In order to send text messages using the "a2p/batch" API, you need to have a phone number which has the A2P SMS feature enabled.

To detect programmatically if a user extension has phone numbers which have been provisioned for A2P SMS, implement the following steps in your app:

1/ Read the user's phone numbers

GET '/account/~/extension/~/phone-number

2/ Parse the response

var a2pSMSEnabledNumbers = []
for (var record of jsonObj.records){
  // detect A2P Toll Free SMS number
  if (record.paymentType == "TollFree") {
    if (record.type != "FaxOnly"){
      for (var feature of record.features){
        if (feature == "A2PSmsSender"){
          var item = {
                       "number": record.phoneNumber,
                       "type": "Toll-Free A2P SMS Number"
                     }
          a2pSMSEnabledNumbers.push(item)
          break;
        }
      }
    }
  // detect A2P 10-DLC SMS number
  }else if (record.paymentType == "Local"){
    if (record.usageType == "DirectNumber"){
      if (record.type != "FaxOnly" ){
        for (var feature of record.features){
          if (feature == "A2PSmsSender"){
            var item = {
                         "number": record.phoneNumber,
                         "type": "10-DLC A2P SMS Number"
                       }
            a2pSMSEnabledNumbers.push(item)
            break;
          }
        }
      }
    }
  }
}