The Definitive Guide to Fax Passthru None vs. Reinvite

E.g. both devices which send fax and receive fax should support T38. Terminating or originating T38 from/to Asterisk is not supported. e.g. such ... ... and fax machine. The whole point (as I specified in the header and initial message) is the attempt to use "Fax for Asterisk" to send the ... The transition between voice protocols and fax protocols requires that the Session Initiation Protocol (SIP) re-negotiate the call from voice to fax. This means ... The following sections cover each method in more detail. Dynamic Provisioning. Dynamic provisioning is done through a feature called modem passthrough. Modem ... 152 is supported by all gateways. Pseudo VBD – fax pass-through method that allows transporting audio and VBD signals with the same media (codec) ... If choose Fax Passthru Method : ReINVITE on the ATA, I get the below error in the Asterisk log and the fax connection times out. [2012-12-26 ... FAX Passthru Codec: G711u (USA) or G711a (rest of the world) FAX Passthru method: ReINVITE. FAX Enable T38: yes. FAX T38 ECM Enable: yes. Fax ... This option is the time we wait after we got the CED, to get V21 flags. This is to avoid to send a SIP re-invite in passthrough and few ms after ... 30 fax or it won't work. If you are using txfax for sending and rxfax for receiving, remember to use the same codec at both ends. Invoking the ... Save your changes and you should be able to send and receive T38 faxes through your PBX now. Set your Phone Number to send SIP Username instead of Number Dialed.