Getting Exception using JAIN_SIP api in android VOIP CALL

Question

My requirement is to establish voice calls from android phone to VOIP landline phone, its perfectly working using android sip protocol API. But its not working on all android version mobiles. Now i am trying to develop using JAIN-SIP third party API.I have done every thing as per API,but i can't able to solve my problem by using this api as shown below link.

Link : https://github.com/Mobicents/restcomm-android-sdk/tree/master/Examples/JAIN%20SIP

I am getting this exception:

Answer 1

确保您已连接到WIFI或任何其他数据连接，当SIP堆栈尝试从提供的域中查找远程端点（IP和端口对）时，抛出此异常。