We have a client who has a fax machine connected to their ATA 186 that is configured in thier CUCM 7. No problem with incoming and outgoing calls, it can receive fax messages from PSTN. The problem is it can not send fax messages, the status is connecting until it this disconnects.
1.) upgraded the ATA 186 to the latest firmware version.
2.) adjustments had been done already on the ATA side.
3.) tried another brand of fax machine and connect it to the ATA 186.
Still no luck.. Any comments and suggestions are highly appreciated..