Haven't seen your config as it has now expired, please bear this is mind if I'm teaching you to suck eggs!
Is there any compelling reason for using Skinny? We've had quite a few strange problems using Skinny so we've decided to only use H323 for customers with CME and fax machines connected through ATAs.
It takes a bit more effort to set up the first time when compared to Skinny, but it seems to work every time (not had any complaints with H323 faxes yet).
First thing to do is upgrade/change the firmware on the ATA, you'll need to download the firmware from CCO (ata_03_01_02_h323_040927_1.zip is what I've been using lately) and then run a small exe contained in that zip file) from a PC on the same network as the ATA. From the ATA, use an analogue phone and use the IVR to upload the new firmware (basically you enter 100#192*168*1*1*8000# - depending on the IP address of the pc running the exe)
Once this is done, browse to the ATA (xxx.xxx.xxx.xxx/dev) and set up a static IP address, tftp server, UID (ext. # of fax), and gateway (CME router). There are a number of other settings that need to be correct, but these are usually the defaults.
Now create a dial-peer, this is a template that I've used ...
dial-peer voice ## voip
description *** Outgoing Fax Calls ***
destination-pattern !### ? internal extension
modem passthrough nse codec g711ulaw
session target ipv4:!**static IP address for ATA**!
incoming called-number ** external number** !(the number passed on by the exchange)
fax rate disable
This should now work without any issues including higher than 9600 speeds.
If you have any problems with this, reply on here and I'll try to help some more.
I absolutely agree with Glenn about using H323. Even though CME 4.0 indicates ATA 186 does work in skinny mode, for faxing , i would suggest that you convert the load to H323 and setup dial-peers in teh CME router to send the fax call to the ATA. Make sure the dial-peer has fax passthrough enabled using modem passthrough command under the dial-peer and also disable fax relay using command "fax rate disable"
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