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Fax over VoIP Killing Me

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@stevensedory wrote:

I have several Cisco SPA112's and they're having issues. We have them configured at our clients sites, with site-to-site VPN's in place. Phones work great, and these Cisco SPA112's show as connected properly in the Asterisk Peers, but we can't get faxes to go through consistently, if much at all.

We've successfully received a few faxes (as in 2-3 out of 40), but can't seem to send any.

I've played around with the adapter's settings, followed various suggested settings, and have set the TX/RX speeds to 9600 and disabled ECM on the fax machines themselves.

Is there a good way to get some feedback from FreePBX/Asterisk?

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