Iax2 call volume (audio)

Is there any way to increase the (audio) volume on a call across an IAX2 trunk ?,

We have 4 sites each with their own instance of FreePBX 14 (on Asterisk 13 ), each with their own SIP Trunks and also joined with IAX2 trunks for desk-to-desk dialling.across a corporate WAN.

Initial testing is showing that the call (audio) volume on the SIP trunks is perfect as are internal calls on each system, but the desk-to-desk calls could do with a few dB extra gain.

Can this be done from the FreePBX GUI ?, say by an “Other IAX setting” in IAX settings/Advanced ?



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