I did not try such a thing before, but if you are using a dialer, you can not change the layer 2 encapsulation, because it is not a leased line, rather it is a normal pri, with lapd. You can not communicate with the teleco's equipent with ppp.
Unfortunately, that doesn't work. I tried different ways - line protocol is up only with HDLC encap.
As for a Telco between routers, we have our own Digital Automatic Switching Center, that will be connected between routers. The topology:
The're no problem with DASC. At present moment, routers are connected directly with each other.
It's interesting to note, that if I configure Controller E1 with 'Channel-group' command, all works perfectly, as with DASC, as without it. I can set encap HDLC or PPP for Serial int - that doesn't matter, files are transmited from LAN1 to LAN2 succesfully.
In any case, thank you everybody. Hope, I'll solve this trouble in the future.
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