When you define channel groups, the timeslots you group are "data" timeslots. The E1 signalling channel is not included. What I mean is, timeslot #15 as a parameter on the channel-group command is not the signalling channel of the E1. So you can do it like your first option, that is:
i have grouped it as 1-15 n 16-31 using channel-group command, now i want to use these serial interfaces( serial 1/0:1, serial 1/0:16) as backup dial-out interfaces for my primary LLs, i tried creating a dialer interface for these but i cant associate it with these serial interfaces. wht is the mechanism to use them for dialing out.
I don't like to give this easy answer, but in this case it's easier for you to understand how to configure it. I believe you can treat your serials as normal ISDN interfaces (BRIs or full PRIs, because ISDN signalling is still there!).
If you want to use them as backup interfaces, you can use floating static routes, backup interface (use your dialer interfaces as backup, not your serials) or dialer-watch.
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