AudioControl VERSION 6.2 manual Fax Transmission behind NAT

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

23.Fax Transmission behind NAT:

	Product
MP-11x		MP-124
Mediant 600		Mediant 1000
Mediant 800 MSBG		Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310		Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410		Mediant 3000 HA/TP-8410
	Management Protocol

Web

INI

SNMP

EMS

CLI

This feature provides support 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 the 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.

This feature is enabled using the new parameter, T38FaxSessionImmediateStart. The No-Op packets are enabled using the existing NoOpEnable and NoOpInterval parameters.

24.Euro-ISDN Message Waiting Indication (MWI) for IP-to-Tel Calls:

	Product
MP-11x		MP-124
Mediant 600		Mediant 1000
Mediant 800 MSBG		Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310		Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410		Mediant 3000 HA/TP-8410
	Management Protocol

Web

INI

SNMP

EMS

CLI

This feature provides support for Euro-ISDN MWI for IP-to-Tel calls. The device interworks SIP MWI NOTIFY messages to Euro-ISDN Facility information element (IE) MWI messages. This is supported by the existing VoiceMailInterface parameter (set to 8).

Version 6.2 39 December 2010