Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry I didn't see your question earlier and to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) Can you double-check the Model Number of the system you are working with? I only ask because it appears that one LETTER may be missing in the model.
2) Do you have a FULL manual for this system, or just a "quick guide" to work from?
Please REPLY using the box below and the SEND button.