To begin, know your CO type. Most Northern Telecom DMS ISDN switches follow the ‘Custom’ protocol, sometimes referred to as National ISDN Standard 1 (NI1). However, some DMS ISDN switches are NI2. Most other CO switches follow the NI2 standard…
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RE: If the code 325 is saying invalid feature code, then possibly the code is restricted or your vendor has changed t… http://disq.us/15su0a2011-02-16