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Have you tried more or less this?:
Go to beginning of table Dial Code: 669Toggle between Name/Number: MUTEStep to next/previous table entry: Volume Up/Down
Is that showing nothing but 000000 or nothing when you do the above? or what is it showing?
Also, you may need to enable logging of the incoming and/or outcoming calls.
I'm not sure where it is, partly because I do not know what (exactly) the STS System in question is. But I was cribbing from info about the STS3 System (if I recollect correctly from what I looked up last night.)
What STS system is it, please?
I'll have to research that to get further data (though an exact version on the software would help.)
How soon do you need the data?
Depends upon the exact machine hosting the system or holding the system... some, on power failure, might well lose data.
Let me know what the STS System's level # ***** type is, please. Sometime or other. Thanks.