Maximum simultaneous calls to/from one extension

I have a Grandstream GXW4216 ata/fxs gateway setup feeding an analog phone system. I presently only have 1 sip account programmed into it & 12 fxs ports using that 1 sip account, that sip account comes off my freepbx as an extension. I can have multiple calls simultaneously thru that extension, as I’ve tested it up to 4 simultaneous calls, but I’m wondering if there’s some limit somewhere either on the ata or in freepbx, as the client reported today receiving a max simultaneous calls reached message when trying to make an outbound call.

fixed it, it is apparently set per extension with a system default of 3, so I set this extension accordingly at:
extensions > extension# > advanced > outbound concurrency limit

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