Forward Global Virtual Network Service (GVNS)

           8  7  6  5  4  3  2  1
        1           OPSP subfield
        1           GUG  subfield
        3           TNRN subfield

The following codes are used in the subfields of the forward GVNS parameter:
a)      Originating participating service provider


8
7
6
5
4
3
2
1

1
O/E
Spare


OPSP length indicator






1a
2nd digit



1st digit



...
...



...



1n
Filler (if necessary)



nth digit



Figure 63.2/Q.735 - Originating participating service provider subfield
1)      Odd/even indicator (O/E)
        0       even number of digits
        1       odd number of digits
2)      OPSP length indicator
        Number of octets to follow. The maximum number of octets is 4, allowing for a maximum number of digits to 7.
3)      Digit
        Digit string in BCD encoding of flexible length representing the Originating Participating Service Provider (OPSP) identification.
4)      Filler
        In case of an odd number of address signals, the filler code 0000 is inserted after the last address signal.
b)      GVNS user group


8
7
6
5
4
3
2
1

2
O/E
Spare


GUG length indicator




2a
2nd digit



1st digit



...
...



...



2n
Filler (if necessary)



nth digit



Figure 63.3/Q.735 - GVNS user group subfield

1)      Odd/even indicator (O/E)
        0       even number of digits
        1       odd number of digits
2)      GUG length indicator
        Number of octets to follow. The maximum number of octets is 8, allowing for a maximum number of digits to 16.
3)      Digit
        Digit string in BCD encoding of flexible length representing the GVNS user group identification (GUG).
4)      Filler
        In case of an odd number of address signals, the filler code 0000 is inserted after the last address signal.
c)      Terminating network routing number


8
7
6
5
4
3
2
1

3
O/E
Numbering plan indicator


TNRN length indicator




3a
Spare
Nature of address indicator







3b
2nd digit



1st digit



...
...



...



3n
Filler (if necessary)



nth digit



Figure 63.4/Q.735 - Terminating network routing number subfield
1)      Odd/even indicator (O/E)
        0       even number of digits
        1       odd number of digits
2)      Numbering plan indicator
        See 3.9 d)
3)      TNRN length indicator
        Number of octets to follow. The maximum number of octets is 9 allowing for a maximum number of digits to 15.
4)      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
0 0 0 0 1 0 0
international number
0 0 0 0 1 0 1
network specific number

spare



reserved for national use
1 1 1 1 1 1 1
spare
5)      Digit
        See 3.9 e)
        The most significant digit is sent first. Subsequent digits are sent in successive 4-bit fields.
6)      Filler
        In case of an odd number of digits, the filler code 0000 is inserted after the last digit.