Handle multiple calls to same client id in twillio

My use case is that if two calls are initiated for the same client ID at the same time, I don’t want the client’s device to ring twice. The mobile device should only connect with one call, and the other call should be routed to a different phone number.

I am initiating a conference call and adding participants to the conference. Before adding a participant, I check their status as follows:

$callsQueued = $twilio->calls->read([
    'to' => 'client:' . $driver,
    'status' => 'queued'
]);

$callsRinging = $twilio->calls->read([
    'to' => 'client:' . $driver,
    'status' => 'ringing'
]);

$callsInProgress = $twilio->calls->read([
    'to' => 'client:' . $driver,
    'status' => 'in-progress'
]);
 if (count($callsqueued)>1||count($callsRinging)>1 || count ($callsinProgress)>1 ){
call to manual phone number 
continue;
}
else {
adding driver into conference 
}

Here, $driver = 235242 refers to the mobile app client ID.
These checks when 2nd call started after a while
The issue arises when two calls are started at the same time. In such cases, $callsQueued = [], $callsRinging = [], and $callsInProgress = [].

How can I prevent this behaviour? I don’t want the client’s device to ring twice."

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