TLS over SIP Performance or SIP in General over mobile networks

Good afternoon,

Recently i implemented SIP TLS extensions over FreePBX.

On my local network there is no problems over my sip ios extension.

However when i change to mobile network the quality is distorted and nearly every time bad.

I have tried all codecs to no avail.

Bandwidth seems sufficient from the carrier, i get about 15 to 20Mbps.

Could this be NAT related?

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