[asterisk-users] Fax passthrough howto codec upspeed

Ivoc
2007-06-28T10:50:16Z

Hello everybody,

  Just was wondering if somebody can help for G711 fax passthrough w/ asterisk.
  The issue I have is regarding codec upspeed when the call is already connected
using G729 for example. The setup is fax---ATA---asterisk---Cisco---fax

  When codec upspeed should happen, ATA or Cisco will send a G711 reINVITE
causing the codec to be switched over, but asterisk does NOT transmit this
reINVITE into the other voice leg so both voice legs regarding asterisk will be
switched to G711. This whay the call is transcoded which is not desirable.

  Any ideas how to fix this?




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