This is first use of Asterisk…
I installed Asterisk FreePBX as virual machine on my windows 10 laptop, and I got this IP 192.168.5.108
I added 2 extensions 1001 and 1002 (iax2)
I installed different SIP clients on my iPhone like Zoiper, Media5 and SessionChat
all of them give me time out message !!
from my iPhone browser I put 192.168.5.108 but I cant connect also !!
For FreePBX peer support, use https://community.freepbx.org/
Also please describe the structure of your private network, and indicate which of chan_sip and chan_pjsip you are trying to use.
Run tcpdump and confirm that the SIP packets are actually reaching the machine.
This all point to network conectivity issue