AudioCodes MP-124 User Manual page 182

Parameter
Fax Relay Max Rate (bps)
[FaxRelayMaxRate]
Fax/Modem Bypass Coder
Type
[FaxModemBypassCoderTyp
e]
Fax/Modem Bypass Packing
Factor
[FaxModemBypassM]
CNG Detector Mode
[CNGDetectorMode]
SIP User's Manual
http://ArtTel.ru
Table 5-35: Media Settings -- Fax/Modem/CID Parameters
Maximum rate (in bps), at which fax relay messages are transmitted
(outgoing calls).
[0] 2400 = 2.4 kbps.
[1] 4800 = 4.8 kbps.
[2] 7200 = 7.2 kbps.
[3] 9600 = 9.6 kbps.
[4] 12000 = 12.0 kbps.
[5] 14400 = 14.4 kbps (default).
Note: The rate is negotiated between the sides, i.e., the gateway
adapts to the capabilities of the remote side.
Coder the gateway uses when performing fax/modem bypass.
Usually, high-bit-rate coders such as G.711 should be used.
[0] G.711Alaw= G.711 A-law 64 (default).
[1] G.711Mulaw = G.711 µ-law.
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.
[0] Disable = The originating gateway doesn't detect CNG; the
CNG signal passes transparently to the remote side (default).
[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. A Re-INVITE message isn't sent
and the fax session starts by the terminating gateway. This option
is useful (for example) when the originating gateway is located
behind a firewall that blocks incoming T.38 packets on ports that
have not yet received T.38 packets from the internal network (i.e.,
originating gateway).
[2] Events Only = CNG is detected on the originating side. The
CNG signal passes transparently to the remote side and a fax
session is started by the originating side using Re-INVITE
message. Usually, T.38 fax session starts when the 'preamble'
signal is detected by the answering side. Some SIP gatewaya
don't support the detection of this fax signal on the answering
side, thus, for these cases it is possible to configure the gateway
to start the T.38 fax session when the CNG tone is detected by
the originating side. However, this mode is not recommended.
Description
182
MediaPack Series
Document #: LTRT-65409