I configured the ata device in callmanager 8.5 version and given ext:6659, it is working fine their is incoming and outgoing calls, but when i want to use it for fax machine it is not working I even edited the settings audiomode =0x00050005 connectmode = 0x00000400 LBRcodec=3
whenever I call a fax number its not ringing and giving a busy tone and getting disconnected Can anyone guide?
The first questionable piece is why you are getting a busy signal. The fax switchover happens after the call connects so you should be able to dial any number. If you can't, you need to troubleshoot that as a normal call routing issue.
Once you're able to call the number but the fax machines either fail to train or train but fail to transmit pages then you need to verify that the PSTN gateway your ATA is interacting with has a compatible fax passthrough configuration applied. From the TechNote above, this would involve at least two commands:
voice service voip
modem passthrough nse codec g711ulaw
fax rate disable
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