Hey, think you are missing a dialer pool command on the dialer interface and a dialer pool-member command on the bri interface. Once you put them in, it will accept the dialer string. So for example, under int dialer 1, dialer pool 1. Then under int bri0, dialer pool-member 1.
You will also need a dialer-list to define the interesting traffic that will trigger the dialer. The dialer-list number should match the dialer-group in the dialer interface, i.e. 1.
However, I don't think that explains not being able to specify a dialer string. The previous poster was right that you need the dialer pool for that. In fact, on my router if you try to define a dialer string before you have set the pool, it says:
%Configure a "dialer in-band" or "dialer pool" first
We are pleased to announce availability of Beta software for 16.6.3.
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