title: Android configure and create sip calls programmatically
body: <p>I am new to android and SIP. I want to create an application in android through which i can configure and create SIP calls programmatically. I want to encrypt that call. 
  Android includes a full SIP protocol stack and integrated call management services but it will not manage sessions, transport-level communication.
  So anybody who has good idea on SIP/Voip please kindly suggest me how can i achieve this.</p>