Users under the Asterisk cannot call users under the IMS through the SoftCo and the system plays an announcement indicating that the call cannot be connected for the moment.
Step 1 Run the config sip silenceofftofax flag off command to set silenceofftofax to off. If this parameter is set to on, fax negotiation needs to be executed. If the peer device is not a fax machine, fax negotiation fails and a call is released.
Step 2 If the fault persists, contact Huawei technical support engineers.
The silenceofftofax parameter is incorrectly set.