Automatically Switching to T.38 Mode without SIP re-INVITE
                                            In the Automatically Switching to T.38 mode without SIP re-INVITE, when a fax signal is detected, the channel automatically switches from the current voice coder to answer tone mode and then to T.38-compliant fax relay mode. 
                                            
                                                
                                                
                                                
                                                
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                                                    To configure Automatic T.38 mode: | 
                                                
                                            
                                            
                                                
                                                
                                                
                                                
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                                                    1.
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                                                    Open the Gateway General Settings page (Setup menu > Signaling & Media tab > Gateway folder > Gateway General Settings), and then from the 'Fax Signaling Method' drop-down list (IsFaxUsed), select No Fax: | 
                                                
                                            
                                            
                                                
                                            
                                            
                                                
                                                
                                                
                                                
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                                                    2.
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                                                    On the Fax/Modem/CID Settings page, configure the 'Fax Transport Mode' parameter to T.38 Relay [FaxTransportMode = 1]. | 
                                                
                                            
                                            
                                                
                                                
                                                
                                                
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                                                    3.
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                                                    Configure the following optional parameters: | 
                                                
                                            
                                            
                                                
                                                
                                                
                                                
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                                                    'Fax Relay Redundancy Depth' [FaxRelayRedundancyDepth] | 
                                                
                                            
                                            
                                                
                                                
                                                
                                                
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                                                    'Fax Relay Enhanced Redundancy Depth' [FaxRelayEnhancedRedundancyDepth] | 
                                                
                                            
                                            
                                                
                                                
                                                
                                                
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                                                    'Fax Relay ECM Enable' [FaxRelayECMEnable] | 
                                                
                                            
                                            
                                                
                                                
                                                
                                                
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                                                    'Fax Relay Max Rate' [FaxRelayMaxRate] |