решил поиграться CRC4. выключил, перезагрузился, все повторил:

$ cat /proc/zaptel/1
Span 1: "" HDB3/CCS

1 taupci_0.1/1 Clear (In use)
2 taupci_0.1/2 Clear (In use)
3 taupci_0.1/3 Clear (In use)
4 taupci_0.1/4 Clear (In use)
5 taupci_0.1/5 Clear (In use)
6 taupci_0.1/6 Clear (In use)
7 taupci_0.1/7 Clear (In use)
8 taupci_0.1/8 Clear (In use)
9 taupci_0.1/9 Clear (In use)
10 taupci_0.1/10 Clear (In use)
11 taupci_0.1/11 Clear (In use)
12 taupci_0.1/12 Clear (In use)
13 taupci_0.1/13 Clear (In use)
14 taupci_0.1/14 Clear (In use)
15 taupci_0.1/15 Clear (In use)
16 taupci_0.1/CCS HDLCFCS (In use)
17 taupci_0.1/17 Clear (In use)
18 taupci_0.1/18 Clear (In use)
19 taupci_0.1/19 Clear (In use)
20 taupci_0.1/20 Clear (In use)
21 taupci_0.1/21 Clear (In use)
22 taupci_0.1/22 Clear (In use)
23 taupci_0.1/23 Clear (In use)
24 taupci_0.1/24 Clear (In use)
25 taupci_0.1/25 Clear (In use)
26 taupci_0.1/26 Clear (In use)
27 taupci_0.1/27 Clear (In use)
28 taupci_0.1/28 Clear (In use)
29 taupci_0.1/29 Clear (In use)
30 taupci_0.1/30 Clear (In use)
31 taupci_0.1/31 Clear (In use)
4 Clear (In use)
5 taupci_0.1