Calls over generic sip trunk use RTP port range 7000

[DidierDE]

We notice that calls over our SIP Trunk use RTP ports in the range 7000. Why is this?

Normally ports in the 7000 range are for internal calls, or am I wrong? I would think that a range of 9000-10999 would be used here.
This is a SIP trunk to our voice gateway which then connects to our provider.

 

[NikosT_3CX]

@DidierDE your destination is a private ip so the port range here is correct.
The range of 9000-10999 is for VoIP Providers that are public ones.

 

[DidierDE]

that is indeed the internal interface of our voicegateway. I did not know that 3CX uses the ip address to decide if it is an internal or external call. I would think that anything going out of the pbx through a sip trunk is an external call...
Is there a way to set the port range in the provider template?