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Sending fax over Twilio


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I am trying to setup fax over a twilio SIP trunk and I keep getting an error from Twilio that the phone system is sending a T.38 invite even when 'Use T.38 for fax' is disabled on the sip trunk settings. Is there anywhere else I need to disable this to get faxes working over a twilio SIP trunk?

I am aware that twilio is discontinuing their fax service, but apparently this only applies if using T.38 or their programmable fax feature.

Any help would be appreciated. Thanks. 

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