title: Setup Voip Call from SIP Account in php
body: <p>I have my CMS built in the php, now I want to integrate Voip call on when admin click on the any user's phone number, but I didn't find any solution to get it done. All I have a SIP details of admin and the second user. 
  I did tried the example shown in below link but not working:
  <a href="https://level7systems.co.uk/en/click_to_call_with_php_sip/" rel="nofollow">https://level7systems.co.uk/en/click_to_call_with_php_sip/</a>
  it always returning <code>No final response in fr_timer seconds</code></p>