Yes, you can. The T.38 protocol will only engage if a fax machine is detected on the call. This is especially useful to home or small business users who need both a voice and fax line but want to keep things simple. If you are a PBX admin planning to use another carrier for voice, we highly recommend testing your outbound routes to make sure both voice and fax calls are routing as you'd expect.
Can I place voice calls using T38Fax?
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