Question about Adtran ISU 512 Multiplexer
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Posted on Jan 02, 2017
SOURCE: front panel dialing
You need to check in the 'network options', 'dial line', #4 'dial options' to see if you have the front panel function enabled.
As for not being able to call ISDN in the US, that is a possible routing or long distance service issue you need to have looked at by your service provider.
Posted on Jan 06, 2009
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