Media New Parameters; Table 1-7: New Media Parameters For Release 6.2 - AudioCodes MEDIAPACK VERSION 6.2 Release Notes

SIP Release Notes

1.11.3 Media New Parameters

The table below describes the new media parameters for Release 6.2.
Notes:
Parameter
[T38FaxSessionImmediateStart]
T38 Version
[SIPT38Version]
Version 6.2
These parameters are applicable only to the Gateway application.

Table 1-7: New Media Parameters for Release 6.2

Enables fax transmission of T.38 "no-signal" packets to the
terminating fax machine.
[0] Disable (default)
[1] Enable
This is used for transmission from fax machines (connected to
the device) located inside a Network Address Translation
(NAT). Generally, the firewall blocks T.38 (and other) packets
received from the WAN, unless the device behind NAT sends at
least one IP packet from the LAN to the WAN through the
firewall. If the firewall blocks T.38 packets sent from the
termination IP fax, the fax fails.
To overcome this, the device sends No-Op ("no-signal") packets
to open a pinhole in the NAT for the answering fax machine.
The originating fax does not wait for an answer, but immediately
starts sending T.38 packets to the terminating fax machine.
Note: To enable No-Op packet transmission, use the
NoOpEnable and NoOpInterval parameters.
Selects the T.38 fax relay version.
[-1] Not Configured = No T.38 (default)
[0] T.38 version 0 (default)
[3] T.38 version 3 = T.38 Version 3 (V.34 over T.38 support)
Description
95
1. What's New in Release 6.2
December 2010