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Abacus: What are the differences between subscriber and exchange when testing PRI with PCG?

Protocol:PRI Hardware:PCG Software:any version
An exchange means there is a "switch" and behind it, "a subscriber". This is different from subscriber. Firstly, the PRI is asymmetrical. The signaling protocol when working as an exchange is different from working as a subscriber. Secondly, call handling configuration is different. Check on Channel->Terminate Exchange, and compare it with Channel->Terminate Subs.

Product : Abacus,T1/E1(TDM),IUT,6.20,6.11 and below,ISDN