I have an ATA 187 on CUCM 8.51. This is a pretty new device. I configured the device and it registered to the CUCM OK but when i tried to use an analog phone on port 1, i am hearing a lot of static and sound of dial tone is very low. When it is connects to the other phones, the other party hears echo and they barely can hear me.
Surprisingly when the same phone is plugged in to the Port2, it works fine. No static and hears regular dial tone.
I am currently talking to a TAC but he is clueless. I just upgraded firmware to 9.21 from 9.03 but it did not make any difference.. Anyone out there experienced same issue and how did you fixed the issue?
Any help would really appreciated.
I just tried 4 brand new ATA187 and all of them have very bad static on both ports except for one which only had it on port number one.
Did you end up having to replace them or did you find something else?
You can try changing the setting "Impedance" on the ATA port.
-Use 600 ohm real or complex, this should help
-After doing this change please; Apply the config, save the changes and reset the ATA on CUCM device configuration page.