Twilio call phone number masking
<p>We need to connect two customers using voice - but we need to hide customer phone number from each other. We decide to use next approach - <a href="https://www.twilio.com/docs/tutorials/walkthrough/masked-numbers/java/servlets#connect-via-phone-call" rel="nofollow">masked phone numbers by twilio</a></p>

<p>Question is:</p>

<ol>
<li>We connect two customers using twilio number. <strong>Can we use same number for another call or it is 'busy' until call is completed?</strong></li>
<li><strong>If it is 'busy' can we buy for example 20 phone numbers and get available each time we need to make call?</strong></li>
</ol>

<p>Not related but why there is no possibility to buy Ukrainian phone number.</p>

<p>Thanks a lot in advance for any help.</p>