So if you are going to use IAX, you should need to arrange some extra security measures. Because SIP uses no single port in, there is no such a problem. Both the protocols are well designed for better experience of VoIP services, and both have their own pros and cons. I still want to know the detail process of that. Additionally ,as you send me a link teaching how to use Freepbx to configure the connection, I want to ask you another question: I have use a Iax trunk connected two PBXs and users could make phone calls through them.
However, now, I want to add a prefix 9 to distinguish the calls mdae to outside with inside ones. When i change the dial pattern in outbound route using freepbx, from 2xxx to 9 2xxx it cannot work. I want to know why this happens. Thank you!
It is quite complicated. As I mentioned in previously, IAX uses a single session on a single port to handle signalling and bearer traffic.
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