AudioCodes Mediant 600 - Page 642

SIP User's Manual 642 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
n]
EMS: Basic Packet Interval
[FaxModemBypassBasicR
TPPacketInterval]
Defines the basic frame size used during fax/modem bypass sessions.
 [0] = Determined internally (default)
 [1] = 5 msec (not recommended)
 [2] = 10 msec
 [3] = 20 msec
Note: When set to 5 msec (1), the maximum number of simultaneous
channels supported is 120.
EMS: Dynamic Jitter Buffer
Minimal Delay (dB)
[FaxModemBypasDJBufMi
nDelay]
Defines the Jitter Buffer delay (in milliseconds) during fax and modem
bypass session.
The range is 0 to 150 msec. The default is 40.
EMS: Enable Inband
Network Detection
[EnableFaxModemInbandN
etworkDetection]
Enables in-band network detection related to fax/modem.
 [0] = Disable (default)
 [1] = Enable. When this parameter is enabled on Bypass and
transparent with events mode (VxxTransportType is set to 2 or 3),
a detection of an Answer Tone from the network triggers a switch
to bypass mode in addition to the local Fax/Modem tone
detections. However, only a high bit-rate coder voice session
effectively detects the Answer Tone sent by a remote endpoint.
This can be useful when, for example, the payload of voice and
bypass is the same, allowing the originator to switch to bypass
mode as well.
EMS: NSE Mode
[NSEMode]
Enables Cisco compatible fax and modem bypass mode.
 [0] = NSE disabled (default)
 [1] = NSE enabled
In NSE bypass mode, the device starts using G.711 A-Law (default) or
G.711µ-Law according to the FaxModemBypassCoderType
parameter. The payload type used with these G.711 coders is a
standard one (8 for G.711 A-Law and 0 for G.711 µ-Law). The
parameters defining payload type for the 'old' Bypass mode
FaxBypassPayloadType a
nd ModemBypassPayloadType are not used
with NSE Bypass. The bypass packet interval is selected according to
the FaxModemBypassBasicRtpPacketInterval parameter.
Notes:
 This feature can be used only if the VxxModemTransportType
parameter is set to 2 (Bypass).
 If NSE mode is enabled, the SDP contains the following line:
'a=rtpmap:100 X-NSE/8000'.
 To use this feature:

The Cisco gateway must include the following definition:
'modem passthrough nse payload-type 100 codec g711alaw'.

Set the Modem transport type to Bypass mode
(VxxModemTransportType is set to 2) for all modems.

Configure the gateway parameter NSEPayloadType = 100.
 This parameter can also be configured per IP Profile, using the
IPProfile parameter (see 'Configuring IP Profiles' on page 219).
EMS: NSE Payload Type
[NSEPayloadType]
Defines the NSE payload type for Cisco Bypass compatible mode.
The valid range is 96-127. The default value is 105.
Note: Cisco gateways usually use NSE payload type of 100.