title: Can't get SipDemo to register
body: <p>I am developing an application that will make SIP calls using the SIP APIs. I want to use the SipDemo code as my starting point, but when I run SipDemo on my devices (Nexus or Galaxy Tab) I always get "Registration failed. Please check settings." I am using the same username/password/server information that works successfully in Sipdroid.</p>
  
  <p>I inserted log messages in setRegistrationListener to follow what's happening, and I will see onRegistrationDone fire, but then it seems to register again, because it will then see  Registration failed with the error message "registration timed out" followed by registration failed with the error message "cannot initiate a new transaction to execute".</p>
  
  <p>I've been beating my head about this for a few days, and I've got a deadline rapidly approaching. Any help on this issue would be greatly appreciated, or if you could point me to some other examples/tutorials of how to use the SIP APIs. </p>