It’s recommended to not enable “extended_roundtrip”, since it has been shown that this cause interoperability problems.
Not all gateways support recovery packets, but then the recovery packets will be ignored. Note that at the same time as the recovery_packets is increase, the bandwidth requirement increase as well. For more details see [3].
4.1.4VoIP timer
To avoid that the fax port is used as a telephony port using Voice over IP, it is possible to restrict for how long a voice call is allowed. If no fax tones are detected i.e. switching over to T.38, within a certain time the call is closed by the W25. The time is configurable and default value is 60000 ms (60s). If configured to “0”, the timer will never expire, i.e. the call will not be closed by the FWT. The parameter name is:
telephony. pots.line_interface[0].voip_session_timeout 60000
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