TELES VoIP Box BRI Series, Справочное руководство

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5 Additional VoIP parameters
VoIPBox DSL / VoIPBox BRI – version 21.0.009 Page 109
5.9 Fax/modem parameters
Table 5.11
→
list some parameter for VoIP fax.
Table 5.11 Customized parameters: VoIP fax
VoIP Fax/Modem Parameters
VoipAPartyCanSwitchToT38=<mode>
Enter Yes (default) to activate fax detection in both directions. When No is set, fax de-
tection and translation to T.38 are carried out only when the call comes from VoIP.
VoipFaxBypassPayloadType=<num>
Defined the payload type for a fax’s RTP packets when T.38 is not used (default 102).
VoipFaxDisableAfterConnect=<sec>
Deactivates fax detection after the number of seconds entered has passed. This is in-
tended to avoid conversional disruption resulting from fax transmission noises when
a fax machine is next to a phone that has an established call.
VoipFaxECM=<mode>
You can use this parameter to enable the error correction mode for fax transmission:
yes
=enabled,
no
=disabled (default).
VoipFaxMaxDtg=<size>
You can use this parameter to set the maximum size of an outgoing t38 packet,
0
=unlimited (default). Range = 4 - 1020.
VoipFaxMaxRate=<num>
If the peer does not support auto negotiation or has a fixed transmission rate, you can
define the fixed rate:
0 - 2400 Bit/sec1 - 4800
2 - 72003 - 9600 (default)
4 - 120005 - 14400
EXAMPLE:
VoipFaxMaxRate=5
VoipFaxTransport=<int>
0 = fax detection is switched off, no codec fallback at all (default).
1 = signaling will switch to T.38 (framesize 40ms). The codec will change when the sys-
tem detects a fax or modem connection on the channel.
2 = fallback to G711a (framesize 40ms).
NOTE: Bear in mind that if T.38 is defined in the
VoipCompression=<list>
parameter
of the VoIP profile, the system will switch only when it detects a modem connection.
Fax calls will still be transmitted using T.38.
VoipSuppressInitialT38Signalling=<mode> (SIP only)
Enter Yes to suppress the SDP header m=image t38 in all SIP messages until reinvite
of the actual fax detection occurs (default No).
VoipT38Enforce=<mode>
Enter Yes to switch to T38 although the B party does not signalize T38. The box sends
a REINVITE and switch to T38 (default Yes).