ATA186 fax issue when modem passthrough enabled on PRI gateway
Hello fellow support forum members,
Last week I posted an issue I was having where some Verifone chip and pin terminals were failing to negotiate at higher modem speeds. To resolve this, I enabled modem passthrough on our PRI gateway and configured a dial-peer on the VG224 to use modem passthrough and send the call direct to the PRI gateway over IP encoded in G.711ulaw, rather than via the SCCP route. (https://supportforums.cisco.com/message/3683083#3683083)
Since applying this config, ATA adapters are now unable to send faxes to the PSTN.
I am running ATA186s as follows:
with Audio mode and Connect mode set on factory defaults as:
Audio mode: 0x00350035
Connect mode: 0x90000400
The command on the PRI gateway that causes the faxes not to send is this line under voice service voip:
which is what was added last week to get the modem transfer in the chip and pin machines to work.
Using prserv to debug the call connection process from the ATA is somewhat helpful, showing that when the modem passthrough command is turned off on the PRI gateway, the ATA sends a V21 Flag after the dist packet. The traces show that the codec is g711ulaw and the NSE mode is 100:
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