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fax [2020/03/13 03:27]
admin [Dialing Out]
fax [2020/06/08 11:17] (current)
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 If dialing 719 worked, but dialing a 7 or 10 digit number does not: Some of the more picky firewalls detect an outgoing fax as a UDP broadcast storm and drop the connection right after it gets started. We have three options: If dialing 719 worked, but dialing a 7 or 10 digit number does not: Some of the more picky firewalls detect an outgoing fax as a UDP broadcast storm and drop the connection right after it gets started. We have three options:
-  * Reconfigure the firewall to be less paranoid (methods vary per firewall/​router). ​ +  * Reconfigure the firewall to be less paranoid (methods vary per firewall/​router). Some "SIP ALG" firewall ​settings ​allow voice calls to work, and block fax. A symptom is sometimes detectable when calling the fax machine or virtual fax as a failure to negotiate and silence before the "​warble"​. Turn off "SIP ALG" ​or "VOIP Helper" and test.     
-  * Some "SIP ALG" firewall ​setting ​allow voice calls to work, and block fax. A symptom is sometimes detectable when calling the fax machine or virtual fax as a failure to negotiate and silence before the "​warble"​. Turn off SIP ALG or SIP "helper" and test.     +
   * An alternative configuration (not out default) for the HT801/HT802 that the ring-u support team must create.   * An alternative configuration (not out default) for the HT801/HT802 that the ring-u support team must create.
   * A saner firewall/​router for business applications. We recommend the Ubiquiti Edgerouter for example. ​   * A saner firewall/​router for business applications. We recommend the Ubiquiti Edgerouter for example. ​