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The example in Tables 1 and 2 is another scenario where fax support is required. In this example we assume that Carrier 1 can support G.729A encoding as well as G.711. In the packet-to-packet control fields of the two PSPs we have selected "conditional" transcoding with no explicit conditions selected. This causes 

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 to transcode only if required to match disparate Carrier 1 and Carrier 2 codecs. Since in this case both carriers support G.729A, no transcoding is needed for the initial audio portion of the call. Either

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s or Carrier 2 may detect the fax tone and initiate a modification of its media stream that agrees with the Fax Tone Treatment setting in the

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's Codec Entry. The fax portion of the call will require transcoding between G.711 and T.38 by

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.

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Caption
0 Table 1 G.729 Pass-Thru with G.711 to T.38 Fallback for Fax Codec Entries
Configuration Value G711-DEFAULT G729A-DEFAULT FaxViaG711 G729A-DEFAULT FaxViaT38 Audio Encoding G.711 G.729A G.729A Fax Tone Treatment <none> Fallback to G.711 Fax Relay Packet Size 10 ms 10 ms 10 ms Fax Treatment Failure Handling Continue Continue Continue G.711 Law Law from other leg  N/A N/A Modem Tone Treatment None None None Modem Treatment Failure Handling Continue Continue Continue DTMF Relay None None None

 

 

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