No audio when external call gets forwarded to another external number

[Stewart1 (Stewart)]

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No sound on misc destinations

Hello, Using pjsip on FreePBX 14.0.5.25 (Asterisk 13.24.1) on my landline, I have a misc destination setup to my cell phone. When the deviation is activated and people call my landline, it establishes a connection with my cell that I can answer, but then NO SOUND at all. After a while, it disconnects. There are some related questions, but on chan-sip (activating fax, adding progressiveband, etc.), so it does not help Anybody with any idea why that happens and what can be done to cure this ? …

In your router/firewall, forward the RTP port range (default UDP 10000-20000) to the PBX.
Or, set up some way to send audio from Asterisk prior to the cell being answered.