AudioControl VERSION 6.2 manual Media New Parameters, SIPT38Version

SIP Release Notes 1. What's New in Release 6.2

1.11.3 Media New Parameters

The table below describes the new media parameters for Release 6.2.

Notes: These parameters are applicable only to the Gateway application.

Table 1-7: New Media Parameters for Release 6.2

Parameter	Description
[T38FaxSessionImmediateStart]	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.
T38 Version	Selects the T.38 fax relay version.
[SIPT38Version]	[-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)

Version 6.2 95 December 2010