Different IP for signaling and RTP

Is it possible to configure FreePBX in a way, that SIP signaling will use one IP (over “slow” TCP based VPN), but RTP will use another IP (public one with no speed limitation)?

Asterisk itself, with PJSIP, has the “media_address” and “bind_rtp_to_media_address” options which can be used for explicitly setting and binding to the IP address to use for RTP. I don’t know if that is exposed in FreePBX, or if it would specifically work for your usage.

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