Revolutionize Fax Passthru with Method None vs. Reinvite A Detailed Analysis

To allow sending G711 passthrough faxes, compile SpanDSP plugin. you need to find out what method the provider uses for T38 (FEC or redundancy method) ... * FAX Passthru Method: None *. • FAX Passthru Method: ReINVITE. * FAX ... Select the codec for fax passthrough, G711u or G711a. The default is G711u. Select the fax passthrough method: None, NSE, or ReINVITE. The default is NSE ... 38 with redundancy. Passthrough - Delay<1000ms, Jitter<30ms, Packet loss should be NONE. Protocol Based switchover - This is standard based. changing codecs should not require a re-invite, as you can switch between the negotiated codecs at the RTP level, so if that was the intention, ... ... and FAX Passthru Method as ReINVITE. Click Submit to save your settings ... None, FAX Disable ECAN, yes. Release Unused Codec, yes, FAX Enable T38, yes. FAX T38 ... 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 ... All session modifications to and from the T.38 fax media will be accomplished using re-INVITEs. The CSP supports the fax pass-through mode. In this mode, the ... 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 ... 38 re-INVITE SHOULD initiate the subsequent re-INVITE to fax pass-through mode. J-F. Mule/J. Li 6 SIP T.38 Call Flows February 2002 Refer to section 6.2 for ...