Can't hear incoming caller's voice

@jyost wrote:

When people call from outside we cannot hear their voice. They can hear our voice but we cannot hear them.

I have seen this issue before but the problem has usually been a firewall issue. In our case, there is no internal firewall. I have disabled the firewall in FreePBX and we are not using an external trunk. We are using the Sangoma Euro 50 Gateway FXO/FXS appliance to convert 2 analog phone lines to a SIP trunk. Both the FreePBX appliance and the Gateway are sitting inside our internal network.

Other similar issues were resolved by configuring the NAT settings. I've been over these several times and I can't find anything wrong. Both the FreePBX and the Gateway are assigned fixed IP addresses by the router and I have changed the external IP address under Astrisk SIP Settings > General SIP Settings > External Address to be the assigned IP address of the FreePBX appliance.

For reference, this is the setup we're using:
Sangoma FreePBX 60 Appliance
PBX Firmware: 10.13.66-16
PBX Service Pack: 1.0.0.0
FreePBX Version: 13.0.191.11
Sangoma Euro 50 Gateway
Phones: Yealink SIP-T29G and SIP-T21E2

Thanks in advance for any advice.

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