external audio devices on iPhones

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Hello group, I'm trying to establish support (for our customers) of an iRig
HD2 microphone and associated iRig products on iPhone. The external devices
work fine with Linphone if the phone is recent, meaning it has a USB-C
port.  On older iPhones with lightning ports, the external device is not
enabled. Under Linphone, the phone's internal mic and speaker continue to
function. Funny thing is, on these older phones the external devices
work fine on the iPhone's voice recorder app.

Has anyone experienced this and perhaps found a work-around?

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<div dir=3D"ltr">Hello group, I&#39;m trying to establish support (for our =
customers) of an iRig HD2 microphone and associated iRig products on iPhone=
. The external devices work fine with Linphone if the phone is recent, mean=
ing it has a USB-C port.=C2=A0 On older iPhones with lightning ports, the e=
xternal device is not enabled. Under Linphone, the phone&#39;s internal mic=
 and speaker continue to function. Funny thing is, on these older phones th=
e external devices work=C2=A0fine on the iPhone&#39;s voice recorder app.=
=C2=A0<div><br></div><div>Has anyone experienced this and perhaps found a w=
ork-around?</div></div>

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