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Fax Transmission through a Firewall

11

Fax Transmission through a Firewall

Using T.38 with a Firewall

Requirements

The communication channel must remain open for a fax to go through a firewall i.e. the unit 
sends "no signal" packets to fill the dead air intervals that could occur during a fax transmission 
and cause the closure of the firewall.

Configuration

Configuring the T.38 No Signal

Configuring the T.38 No Signal

If you are not familiar with the meaning of the fields, click Show Help, located at the upper right 
corner of the Web page, to display field description when mousing over the field name.

            Steps

1. Go to Media > Codecs.

2. Click 

 located on the same row as 

T.38

.

3. Set the No Signal selection list to Enable.

4. Set the No Signal Timeout selection list to Enable.

NOTE:  

In order to keep RTP ports opened for T.38 packets, the unit will send 'no signal' packets to 

fill the dead air intervals that could occur during a fax transmission and cause the closure of the 
firewall.

5. Click Apply.

Result:

Summary of Contents for TA7100 Series

Page 1: ...Mitel TA7100 58014903 REV00 STANDARD FAX CONFIGURATION...

Page 2: ...echanical for any purpose without written permission from Mitel Networks Corporation Trademarks The trademarks service marks logos and graphics collectively Trademarks appearing on Mitel s Internet si...

Page 3: ...re RTP 8 Selecting the Base Port for T 38 Fax Calls 9 Configuring the Behavior of the T 38 INVITE Not Accepted 10 Fax Transmission through a Firewall 11 Requirements 11 Configuration 11 Configuring th...

Page 4: ...formation Required for Troubleshooting Information Type Fax Transmission Protocol Clear Mode T 38 Fax Transmission Speed High speed Low speed Fax mode Automatic Manual Receiving fax Model Make Sending...

Page 5: ...cy packets will increase the bandwidth used The higher the speed the more bandwidth is used May take more bandwidth than a fax in Clear channel Requirements The Mitel unit must be able to detect a CNG...

Page 6: ...you are not familiar with the meaning of the fields click Show Help located at the upper right corner of the Web page to display field description when mousing over the field name Steps 1 Go to Media...

Page 7: ...right corner of the Web page to display field description when mousing over the field name Steps 1 Go to Media Codecs 2 In the Codec section click located on the same line as T 38 3 In the T 38 table...

Page 8: ...use in this situation 5 Click Apply Result Allowing Unsecure T 38 with Secure RTP If you are not familiar with the meaning of the fields click Show Help located at the upper right corner of the Web pa...

Page 9: ...iliar with the meaning of the fields click Show Help located at the upper right corner of the Web page to display field description when mousing over the field name Steps 1 Go to Media Misc 2 In the B...

Page 10: ...for T 38 fax If you are not familiar with the meaning of the fields click Show Help located at the upper right corner of the Web page to display field description when mousing over the field name Ste...

Page 11: ...ng the T 38 No Signal If you are not familiar with the meaning of the fields click Show Help located at the upper right corner of the Web page to display field description when mousing over the field...

Page 12: ...G 726 32 Low bit rate codecs cannot be used for fax transmission Gateway dynamically changes the codec from the codec configured for voice to G 711 with no VAD and no EC for the duration of the fax s...

Page 13: ...of the fields click Show Help located at the upper right corner of the Web page to display field description when mousing over the field name Steps 1 Go to Media Codecs 2 In the Codec section click l...

Page 14: ...Clear Channel Fax Transmission 14 4 Make sure to enable the Data Transmission 5 Click Apply Result For example...

Page 15: ...the V 21 Modulation Detection selection list to Enable 5 Set the Behavior On CED Tone Detection selection list to Fax Mode 6 Click Apply Result IF AND THEN If T 38 is enabled A CNG tone is detected or...

Page 16: ...t in the web browser some aspects of the configuration can only be completed with the MIB parameters by using a MIB browser such as the Mitel Unit Manager Network UMN using the CLI creating a configur...

Page 17: ......

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