thx pan !
the only reason why the TFO would interfer is if the server itself is communicating with a modem.
in this case, we would have ms-ms calls (or modem-modem).
the thing i don’t understand is why the TFO would impact the FACCH. They are not carried over speech frames, they probably go through the RSL on Abis and N7 ts on the A interface, don’t they ?
Before “Ivann” can confirm, don’t you think it is possible that both modems are sending tones over speech frames ?
i forgot to check “TFO faults database” at work, i’ll try to do it tomorrow.