Hi!,
I am following the steps as you mentioned in the documentation.
I am making call from X-lite with iptel.org domain.
I am getting this Error(PFA).

could you please help me with this.
System Details:
OS : Ubuntu 16.04,64bit
Processor :AMD FX(tm)-6300 Six-Core Processor × 6
Python :2.7.12
Thanks,
Praveen.