AudioCodes MediaPack 114 Manual de usuario descargar pdf (Pagina 322)

SIP User's Manual 322 Document #: LTRT-65411

MediaPack Series

7.3.2.3 Fax / Modem NSE Mode

In this mode, fax and modem signals are transferred using Cisco-compatible Pass-through

bypass mode. Upon detection of fax or modem answering tone signal, the terminating

device sends three to six special NSE RTP packets (using NSEpayloadType, usually 100).

These packets signal the remote device to switch to G.711 coder (according to the

parameter FaxModemBypassCoderType). After a few NSE packets are exchanged

between the devices, both devices start using G.711 packets with standard payload type (8

for G.711 A-Law and 0 for G.711 Mu-Law). In this mode, no Re-INVITE messages are sent.

The voice channel is optimized for fax/modem transmission (same as for usual bypass

mode).

The parameters defining payload type for the proprietary AudioCodes’ Bypass mode

FaxBypassPayloadType and ModemBypassPayloadType are not used with NSE Bypass.

When configured for NSE mode, the device includes in its SDP the following line:

a=rtpmap:100 X-NSE/8000

(where 100 is the NSE payload type)

The Cisco gateway must include the following definition: "modem passthrough nse payload-

type 100 codec g711alaw".

To configure NSE mode, perform the following configurations:

 IsFaxUsed = 0

 FaxTransportMode = 2

 NSEMode = 1

 NSEPayloadType = 100

 V21ModemTransportType = 2

 V22ModemTransportType = 2

 V23ModemTransportType = 2

 V32ModemTransportType = 2

 V34ModemTransportType = 2

 BellModemTransportType = 2

7.3.2.4 Fax / Modem Transparent Mode

In this mode, fax and modem signals are transferred using the current voice coder without

notifications to the user and without automatic adaptations. It's possible to use the Profiles

mechanism (refer to ''Configuring the Profile Definitions'' on page 169) to a

pply certain

adaptations to the channel used for fax / modem (e.g., to use the coder G.711, to set the

jitter buffer optimization factor to 13, and to enable echo cancellation for fax and disable it

for modem).

To configure fax / modem transparent mode, use the following parameters:

 IsFaxUsed = 0

 FaxTransportMode = 0

 V21ModemTransportType = 0

 V22ModemTransportType = 0

 V23ModemTransportType = 0

 V32ModemTransportType = 0

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