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This parameter allows the IP-PBX to send a short burst of T.38/T.30 no-signal messages<br />

during the setup of T.38 Fax calls.<br />

Emitting these no-signal messages is especially useful when the IP-PBX is connected to an<br />

external NAT-L3 router. The UDP Fax port is consequently enabled in the NAT and incoming<br />

T.38 traffic is routed to the IP-PBX.<br />

The default value 00 does not send no-signal message.<br />

The 01 value sends no-signal messages for T38 fax calls.<br />

Disable History-Info<br />

Presentation<br />

Name<br />

Position<br />

(byte)<br />

Length<br />

(byte)<br />

Default Range Example<br />

Disable_hi 20 1 00 00-01 00 (default value) means<br />

History-Info is enabled.<br />

Description<br />

This parameters allows to disable the support of History-Info (RFC 4244) header in send and<br />

receive.<br />

The default value 00 results in enabling the History-Info.<br />

The 01 value results in disabling the History-Info.<br />

Disable Optimization of Authentication<br />

Presentation<br />

Name<br />

Position<br />

(byte)<br />

Length<br />

(byte)<br />

Default Range Example<br />

auth_optimize 21 1 00 00-01 00 (default value)<br />

means Optimization of<br />

Authentication is enabled.<br />

Description<br />

This parameters allows to disable the support of Optimization of Authentication.<br />

The default value 00 results in enabling Optimization of Authentication.<br />

The 01 value results in disabling Optimization of Authentication.<br />

Enable Force DNS_A resolution<br />

Presentation<br />

6-87

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