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;

          }

        }

      }

    }

  }

}