I have a freepbx installation using the internal firewall and fail2ban right up against the static external IP address. I can call between the 4 digit extensions just fine. I can not however do call transfers? When I try and do a transfer it goes straight to voicemail for that extension. Any ideas on how to fix this?
Can you post an asterisk console output during a call transfer?
It looks like it might have been the phone that I was using. I had some old Mitel phones and that seemed to be causing the problem. When I tried Yealink or Sangoma phones the transfer appears to work fine.
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