working call:


00011000    IE channel identification
00000011        length = 0x03 
              octet 3
1-------        extension bit
-0------        interface identifier = implicitly identified
--1-----        interface type = PRI
---0----        spare bits = spare bits
----1---        pref/excl = exclusive
-----0--        D-channel ind = not
------01        info channel selection = B1 channel
              octet 3.2
1-------        extension bit
-00-----        coding standard = CCITT
---0----        number/map = number
----0011        channel type = B channel
              octet 3.3
1-------        extension bit
-0000010        channel number = 0x02 

 
my trace:
 
00011000    IE channel identification
00000100        length = 0x04 
              octet 3
1-------        extension bit
-1------        interface identifier = explicitly identified
--1-----        interface type = PRI
---0----        spare bits = spare bits
----0---        pref/excl = preferred
-----0--        D-channel ind = not
------01        info channel selection = B1 channel
              octet 3.1
1-------        extension bit
-0000000        interface id = 00 
              octet 3.2
1-------        extension bit
-00-----        coding standard = CCITT
---0----        number/map = number
----0011        channel type = B channel
              octet 3.3
1-------        extension bit
-0000110        channel number = 0x06