Call transfer number

         SS7-ISUP

   8  7  6  5  4  3  2  1
1  a  b  b  b  b  b  b  b
2  c  d  d  d  e  e  f  f
3  gg-2nd-ggg  gg-1st-ggg
.
.
n  --filler--  gg-nth-ggg

a)      Odd/even indicator
 0 - even number of address signals
 1 - odd number of address signals

b)      Nature of address indicator

0 0 0 0 0 0 0  -  spare
0 0 0 0 0 0 1  -  subscriber number (national use)
0 0 0 0 0 1 0  -  unknown (national use)
0 0 0 0 0 1 1  -  national (significant) number (national use)
0 0 0 0 1 0 0  -  international number

0 0 0 0 1 0 1
      to       -  spare
1 1 0 1 1 1 1

1 1 1 0 0 0 0
      to       -  reserved for national use
1 1 1 1 1 1 0

1 1 1 1 1 1 1  -  spare

c) Spare

d)      Numbering plan indicator
0 0 0   spare
0 0 1   ISDN (Telephony) numbering plan (Recommendation E.164)
0 1 0   spare
0 1 1   Data numbering plan (Recommendation X.121) (national use)
1 0 0   Telex numbering plan (Recommendation F.69) (national use)
1 0 1   Private numbering plan (national use)
1 1 0   reserved for national use
1 1 1   spare

e)      Address presentation restricted indicator
0 0     presentation allowed
0 1     presentation restricted
1 0     spare
1 1     spare

f)      Screening indicator
0 0     user provided, not verified
0 1     user provided, verified and passed
1 0     user provided, verified an failed
1 1     network provided

g)      Address signal
0 0 0 0  digit 0
0 0 0 1  digit 1
0 0 1 0  digit 2
0 0 1 1  digit 3
0 1 0 0  digit 4
0 1 0 1  digit 5
0 1 1 0  digit 6
0 1 1 1  digit 7
1 0 0 0  digit 8
1 0 0 1  digit 9
1 0 1 0  spare
1 0 1 1  code 11
1 1 0 0  code 12
spare

h)      Filler
In case of an odd number of address signals, the filler code 0000 is inserted
after the last address signal.