I have an issue with ATA 186 to send faxes. I have tried many things, but the fax sending is unsuccessful. I am not a VoIP expert, so it is pretty hard to me to identify the difference between some commands. This is the topology of the network:
Fax Machine --- ATA ---- CCM ---- VoIPGW --- E1(PSTN)
I opened a TAC Case last december, and after many tests, Cisco Engineer told me that this is a limitation. The workaround that he gave me is to avoid use ATA to connect faxes. I am absolutely dissapointed about this.
There is one relly important detail on this matter, is the fax machine a super G3 fax machine? this is because as you mention there are some limitation for the ATAs to work with fax machines and modems, this is because the device was not designed for this purpose.}
In the follow link you could find some information about the ATA configuration for faxing:
We use ATA's for faxing all over the place. One thing that we noticed is when doing this you can only use the G711 codec on one port and the other port has to be G729. Try setting that up and see if it works for you.
Only one port can be G.729 not both ports if you are faxing across a WAN link, the other will have to be G.711 or another codec.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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