No, it's not possible. Unlike a T1 back-to-back config where you can simply use HDLC keepalives to provide your layer 2 connectivity, ISDN requires signalling from the switch to establish that the circuit is indeed up. There's a lot more to it than just voltage and circuits being complete, as DEBUG ISDN Q921 and DEBUG ISDN Q931 will show.
Hello! Thank you for responding to my question. You mentioned a T1 back-to-back configuration. I am still researching this, but if you don't mind helping once more, can I use a crossover cable between 2 NT1 units? Conversely, could you point me in a direction for more info?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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