How can I communicate two zoiper sip clients registered with Asterisk server, i have MS Windows 7 inthat i have ubuntu in virtualBox, i installed Asterisk server in ubuntu, i have one Zoiper in windows 7, and another in ubuntu, both are registered with Asterisk server.
but I don't know how to communicate(call from one to another)means what contents to be placed in my zoiper dial box(how can i represent another zoiper address) and also please tell me about the extensions.conf.