User`s manual

MediaPack
SIP User's Manual 156 Document #: LTRT-65408
Table 5-43: Media Settings, Fax/Modem/CID Parameters (continues on pages 154 to 157)
Parameter Description
Fax Relay Enhanced Redundancy
Depth
[FaxRelayEnhancedRedundanc
yDepth]
Number of times that control packets are retransmitted when using the T.38
standard.
The valid range is 0 to 4.
The default value is 2.
Fax Relay ECM Enable
[FaxRelayECMEnable]
Disable
[0] = Error Correction Mode (ECM) mode is not used during fax
relay.
Enable [1] = ECM mode is used during fax relay (default).
Fax Relay Max Rate (bps)
[FaxRelayMaxRate]
Maximum rate, in bps, at which fax relay messages are transmitted
(outgoing calls).
You can select:
2400 [0] = 2.4 kbps.
4800
[1] = 4.8 kbps.
7200
[2] = 7.2 kbps.
9600
[3] = 9.6 kbps.
12000
[4] = 12.0 kbps.
14400
[5] = 14.4 kbps (default).
Note: The rate is negotiated between the sides, i.e., the media server
adapts to the capabilities of the remote side.
Fax/Modem Bypass Coder Type
[FaxModemBypassCoderType]
Coder the gateway uses when performing fax/modem bypass. Usually, high-
bit-rate coders such as G.711 should be used.
You can select:
G.711 A-law 64
[0] (default).
G.711 µ-law
[1].
Fax/Modem Bypass Packing
Factor
[FaxModemBypassM]
Number of (20 msec) coder payloads that are used to generate a
fax/modem bypass packet.
The valid range is 1, 2 or 3 coder payloads.
The default value is 1 coder payload.
CNG Detector Mode
[CNGDetectorMode]
[0] = Disable (default). Don’t detect CNG.
[1] = Relay. CNG is detected on the originating side. CNG packets are sent
to the remote side according to T.38 (if IsFaxUsed=1) and the fax session is
started.
[2] = Events Only. CNG is detected on the originating side. The CNG signal
passes transparently to the remote side and fax session is started.
Usually T.38 fax session starts when the ‘preamble’ signal is detected by the
answering side. Some SIP gateways don’t support the detection of this fax
signal on the answering side, thus, for these cases it is possible to configure
the gateways to start the T.38 fax session when the CNG tone is detected
by the originating side. However, this mode is not recommended.