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Did you also call this function to detect the user's phone numbers and if the "from" phone number is SMS enabled?

/*
  Read phone number(s) that belongs to the authenticated user and detect if a phone number
  has the SMS capability
*/
function read_extension_phone_number_detect_sms_feature(){
  global $platform;
  $endpoint = "/restapi/v1.0/account/~/extension/~/phone-number";
  $resp = $platform->get($endpoint);
  $jsonObj = $resp->json();
  foreach ($resp->json()->records as $record){
    foreach ($record->features as $feature){
      if ($feature == "SmsSender"){
        // If a user has multiple phone numbers, check and decide which number
        // to be used for sending SMS message.
        return send_sms($record->phoneNumber);
      }
    }
  }
  if (count($jsonObj->records) == 0){
    exit("This user does not own a phone number!");
  }else{
    exit("None of this user's phone number(s) has the SMS capability!");
  }
}

Thank you for your reply. I forgot to mention that in my code I wasn't calling this function, instead calling send_sms directly and specifying the $fromNumber programmatically, such as:

send_sms('18005551212');

I've updated my code to call this function instead of send_sms, then call send_sms from inside this function exactly as you've shown:

return send_sms($record->phoneNumber);

The code now fails at the highlighted line:

function read_extension_phone_number_detect_sms_feature(){
    global $platform;
    $endpoint = "/restapi/v1.0/account/~/extension/~/phone-number";
    $resp = $platform->get($endpoint);
    $jsonObj = $resp->json();
    foreach ($resp->json()->records as $record){
    foreach ($record->features as $feature){
        if ($feature == "SmsSender"){
            return send_sms($record->phoneNumber);
        }
    }
    }
    if (count($jsonObj->records) == 0){
        exit("This user does not own a phone number!");
    } else {
    exit("None of this user's phone number(s) has the SMS capability!");
    }
}

Here is the truncated error message. It appears to be a permissions issue?

Expected HTTP Error: Client error: `GET https://platform.ringcentral.com/restapi/v1.0/account/~/extension/~/phone-number` resulted in a `403 Forbidden` response: { "errorCode" : "InsufficientPermissions", "message" : "In order to call this API endpoint, application needs to hav (truncated...)

Add the "Read Accounts" app scope to the app and try again. This is documented in the developer guide.

I already have both of the two scopes required that were listed here when you click "Show detailed instructions". Do I need to add another scope as well?

Then it must be a mistake in the JWT token. 2 options to get help.

1. Submit a dev support ticket here. Or

2. Let me know the app client id and the user name (or extension id) who owns that JWT token

Thank you for your help.

Regarding the username/extension Id, do you mean my RingCentral Developer login? My apologies, I'm not 100% sure I know what you're looking for. I can also provide you with the email I used to regsiter? In my user profile it also says I'm extension 200.

I just finished a meeting, but I'll be monitoring this chat the rest of the afternoon and should reply promptly.

The user "Matt Puhl" does not have a phone nor a direct phone number so that user cannot send any text message.

I use the JWT token generated for the app "TTECH JET v3 - Production" and it works well. I could call the API to read extension phone number successfully. It's just there is no number from that user.

@Phong Vu Thank you again for your help.

So the developer account's user must also be licensed in RC and assigned a phone number, does that sound right? I don't want take up all your time, is there any documentation that explains this? I did try to create a support ticket earlier, but got the attached error message.

I'm guessing I just need to talk to management about purchasing a license for my user account - is that what you'd recommend?

I didn't create the RC account, I primarily handle the company's IT systems, but I do see in RC Company Setup > User Management that, as you said, I have no number assigned and that my license type is "Video".

You wrote that your code is working well in sandbox account and now you graduate the app and run it in your production.

A user in your sandbox is not the same as a user in your production!

So if you run the app in the production, here is what you need to have:

Production app client id

Production app client secret

Production server https://platform.ringcentral.com

Production user: A user under your production

I appreciate that, but did you see my last comment? Are you saying my RingCentral account requires a license and phone #? I think that's what you're saying but was hoping for clarification. I understand a Sandbox user is not a Production user, but I wasn't sure what the best next step was.

Ok, I removed and then re-added both of the scopes, saving the app each time. Then I waited 10 minutes and re-tried my code (I made no code changes). Now I get this error:

None of this user's phone number(s) has the SMS capability!

You mentioned in your initial comment that I should confirm this # has SMS enabled. We use our company # to send SMS via RC, but is there something else I need to do? I am searching in the developer guide but haven't found anything yet.