This is the pinout to connect the ISDN/BRI plug from Cisco 2901 to Patton SmartNode 2 x ISDN/BRI.

Plug1
3: White/Blue
4: Blue
5: White/Green
6: Green

Plug2
3: White/Green
4: Green
5: White/Blue
6: Blue

Briefly…. You have to interconnect 3 -> 5, 4 -> 6, 5 -> 3 and 6 -> 4.
I hope it can help you !

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