Trix Box - VoIPtalk IAX Trunk Setup GuideThe VoIPtalk IAX service requires numbers to be sent with the full country code. For example, if you wish to call our office you would send the number in the following format (e164) to our call server:90. A rule can be setup to do this in the GUI. For Outgoing calls:Go to asterisk - FreePBX, then click Setup, and click Trunks.