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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].
4.1.4 VoIP 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
14 2/221 02-FGB 101 327 Uen B – November 2007