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If other checks and remedies fail to correct your problem, it could be that the option in your card/rack/rt has gotten changed or set back to a default.
The fast fix is to get the telco to "look" out the line to the RT and confirm that the options on your card match the options set on the central office for your line. The problem is getting them to agree to look because their tendency is to note that the signal to activate or display the option is leaving the central office therefore it must be your equipment at fault.
If you call the telco and report that you have lost your voice mail's message waiting indicator (the light or the stutter dial tone) or that caller i.d. information no longer displays and they close your trouble reports as service working/no trouble found, call for a new ticket and ask to speak to a supervisor. Inform the supervisor that you reported trouble and it still exists and ask him or her to be certain the proper group (group name varies by location) has looked at the CO and RT options to be certain they are matched.
NOTE: This will not always be the cause/fix. In fact, it is often other causes. Just keep this in mind as an option when the other fixes fail to help.
There are three likely causes for the message waiting indicator to not work after getting DSL. First, your phone is not message waiting capable or defective. Second, the visual indicator feature was not activated in the phone switch for your new line. Third, the CPOTS channel card for your line in the central office is not provisioned to be always on (the OHX feature, On-Hook-Transmission). ADLU cards are by default always on.
However, the message waiting visual feature can cause some headaches also. Some phones are sensitive to the signal and will give a 1/2 ring roughly once an hour. The only solution for that is to get a new phone.
As far as call waiting ID goes, If your regular call ID works on incoming calls, about the only reasons call waiting ID wouldn't work is if your phone is not capable or the feature is not activated in the phone switch.
If your regular call ID does not work after having DSL activated, chances are that your line was moved to an RT. The main causes for this trouble is that the feature was not activated in the switch for the new line or the circuit card for your line in the RT is defective.
These are not very common troubles as far as regular phone service goes. When calling in you will most likely have to get a supervisor on the line to help get the proper systems checked.
shortbus28 contributed the last four paragraphs to this entry.