Yes - Error Correction (ECM). If errors are received, the fax machines will try to re-transmit the frames and complete the page.
I'm deploying Fax Relay in a campus environment that has plenty of bandwidth and there shouldn't be any packet loss. But I'm still planning to use T.38 with H.323 and MGCP gateways since it provides ECM in case of an error, and also it will be easier to identify fax calls.
Forgot to mention - one downside of Fax Relay is you are limited to 14.4 kbps transmission speed. Passthrough can go up to 64 kbps with G.711, although realistically you'll see speeds 9.6 - 33.6 kbps depending on the speed of the fax machine(s).
I tried to use T38 Fax relay, the fax answer but nothing coming out in eitherway, can someone please direct me in the right path and put some examples of what's the correct configurations/ dial-peer on the AS5300, I belive I'm doing something not right at the AS5300. Please note my voice call have no issue what soever "SIP-to-PSTN, SIP-to-SIP, PSTN-to-SIP". Please post your answer to both the forum and my email.
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