No audio with all configuration made

@akkad wrote:

• I have a successful FreePBX 13 installation on Debian as per the steps in FreePBX wiki, I configured 2 extensions, where both can connect and place a call but can not hear each other, also if one party end the call then the call is not ended on the other party.
• I want the server and the clients to use TLS and SRTP only using non standard TLS and RTP ports, also I created FreePBX self-signed-certificate and applied in FreePBX settings.
• My FreePBX PC connect to a wireless router (LAN 192.168.1.xx) that is connected to internet (WAN) via static IP (so I believe I am behind NAT)
• I went through FreePBX SIP audio issues wiki with no luck to resolve it
• Here are all of the configuration I have edited where I left the rest to their default values:

Advanced Settings
- Device Settings
--- SIP nat = yes
--- SIP encryption = yes

Asterisk SIP Settings >> General SIP Settings
- NAT Settings
--- External Address = (My Public IP)
--- Local Networks = 192.168.1.0 / 255.255.255.0
- RTP Settings
--- RTP Port Ranges = start/end = custom range but not (10000-20000)

Asterisk SIP Settings >> Chan SIP Settings
- NAT Settings
--- NAT = Yes
- TLS/SSL/SRTP Settings
--- Enable TLS = yes
--- Certificate Manager = default (self-signed generated by FreePBX certificate management)
--- SSL Method = sslv2
- Advanced General Settings
--- Bind port = custom port but not 5060
--- TLS bind port = custom port but not 5061

Extensions >> Advanced
- Edit Extension
--- NAT Mode = yes (force_rport,comedia)
--- Port = custom port which is the same as default TLS port
--- Transport = TLS only
--- Enable Encryption = yes (SRTP only)

• I have forwarded all the above custom ports from my router to the FreePBX PC.
• I allowed all traffic in debian firewall.
• As I used custom RTP ports, I have un-comment the line "include rtp_additional.conf" from /etc/asterisk/rtp.conf and I assured that rtp_additional.conf contains my custom RTP start/end ports.
• I restarted asterisk after every change.
• I configured 2 android phones using Zoiper to connect to FreePBX externally over 3g/4g network

Please let me know if there are extra settings to do.

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