[span zt PRI_1]
trunk_type => E1
b-channel => 1-15,17-31
d-channel => 16

[span zt PRI_2]
trunk_type => E1
b-channel => 32-46,48-62
d-channel => 47

[span zt PRI_3]
trunk_type => E1
b-channel => 63-77,79-93
d-channel => 78

[span zt PRI_4]
trunk_type => E1
b-channel => 94-108,110-124
d-channel => 109