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Does the landline phone have no sound after the telecom optical modem is changed to a bridge? Don't rush to call the master. I missed copying the voice WAN line once.
After the optical modem was changed to a bridge, the broadband was smooth, but the landline phone had no dial tone. This happened to me once when I failed to copy the voice WAN parameters. This article explains why bridging interrupts calls by the way, which sets of parameters should be copied down in advance, and how to arrange the recovery order. If you follow it, you won’t have to wait for the master to come to your door. ...
