Outbound Calls drop "No request was received in 32 seconds"

Hey there. I’m trying to get android softphones up and working.
My phones are ipsec mobile clients and are always connected to the main network running pfSense.
Following problem:
When connected to wifi, they work perfectly. But when connected via LTE, after exactly 32 seconds every outbound call drops.

Inbound calls work perfectly.
I’m uncertain if this is a firewall or freepbx issue, but I’m posting this here anyway because it definitly can’t hurt. Any advise?

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