IEs: SS7-ISUP, DSS1 Calling party number, DSS1 Connected number
see also: Call transfer number
SS7-ISUP DSS1
8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
1 a b b b b b b b 1 0 1 1 0 1 1 0 0 - IE id Calling party number
1 0 0 1 0 1 1 0 0 - IE id Connected number
2 c d d d e e f f 2 - Length of calling party number contents
3 gg-2nd-ggg gg-1st-ggg 3 j i i i h h h h
. 3a* m l l 0 0 0 k k
. 4* - Number digits (IA5 characters)
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 - network-specific number (national use)
0 0 0 0 1 1 0
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) Number Incomplete indicator (NI)
0 complete
1 incomplete
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 reserved for 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 address not available (Note) (national use)
1 1 spare
NOTE - If the parameter is included and the address presentation restricted indicator indicates address not available, octets 3 to n are omitted, the subfields in items a), b), c) and d) are coded with 0's, and the subfield f) is coded with 11.
f) Screening indicator
0 0 reserved (Note)
0 1 user provided, verified and passed
1 0 reserved (Note)
1 1 network provided
NOTE - Code 00 and 10 are reserved for "user provided, not verified"
and "user provided, verified and failed" respectively. Codes 00 and 10 are
for national use.
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.
DSS1 Calling party number, Connected number
The purpose of the Calling party number information element is to identify the origin of a call.
The maximum length of this information element is network dependent.
The purpose of the Connected number information element is to indicate which number is connected to a call.
The connected number may be different from the called party number because of changes (e.g. call redirection, transfer)
during the lifetime of a call.
8 7 6 5 4 3 2 1
1 0 1 1 0 1 1 0 0 - Information element identifier
2 - Length of calling party number contents
3 j i i i h h h h
3a* m l l 0 0 0 k k
4* - Number digits (IA5 characters)
h) Numbering plan identification (octet 3)
i) Type of number (octet 3)
j) 0/1 ext.
k) Screening indicator (octet 3a)
Bits
2 1 Meaning
0 0 - User-provided, not screened
0 1 - User-provided, verified and passed
1 0 - User-provided, verified and failed
1 1 - Network provided
NOTE 2 - The meaning and the use of this field is defined in 3/Q.951 and
4/Q.951.
l) Presentation indicator (octet 3a)
Bits
7 6 Meaning
0 0 - Presentation allowed
0 1 - Presentation restricted
1 0 - Number not available due to interworking
1 1 - Reserved
NOTE 1 - The meaning and the use of this field is defined in 3/Q.951
and 4/Q.951.
m) 1 ext.
Number digits (octets 4, etc.)
This field is coded with IA5 characters, according to the formats specified in
the appropriate numbering/dialling plan.