User`s manual

MediaPack SIP
MediaPack SIP User’s Manual 138 Document #: LTRT-65405
Table 5-41: Channel Settings, Fax/Modem/CID Parameters (continues on pages 136 to 138)
Parameter Description
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:
G711 A-law 64 [0] (default).
G711 µ-law [1].
G726 32 [4].
G726 40 [11].
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]
Disable [0] = Don’t detect CNG (default)
Relay [1] = N/A.
Event Only [2] = Detect CNG on caller side and start fax session (if
IsFaxUsed=1)
Usually T.38 fax session starts when the ‘preamble’ signal is detected by the
answering side. Some SIP gateways doesn’t’ support the detection of this fax
signal on the answering side, for these cases it is possible to configure the
MediaPack gateways to start the T.38 fax session when the CNG tone is detected
by the originating side. However this mode is not recommended.