The purpose of the Network-specific facilities information element is to indicate which network facilities are to be invoked. The Network-specific facilities information element is coded as shown in Figure 4-27 and Table 4-18. No more than four Network-specific facilities information elements may be included in a single message.
The maximum length of this information element is network dependent.
Bits |
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8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
Octets |
Network-specific facilities Information element identifier |
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0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
1 |
Length of network-specific facilities contents |
2 |
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Length of network identification |
3 |
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1 ext. |
Type of network |
Network identification plan |
3.1* |
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0 spare |
Network identification (IA5 characters) |
3.2* |
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Network-specific facility specification |
4 |
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NOTES 1 Octets 3.1 and 3.2 are only present when the length in octet 3 is non-zero. 2 Octet 3.2 may be repeated as appropriate. |
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Network-specific facilities information element
Network-specific facilities information element
Length of network identification (octet 3) |
|
This field contains the length, in octets, of the network identification found in octet 3.1 and the repetition of octet 3.2. If the value is "0000 0000", then the default provider (see E.1) is assumed and octets 3.1 and 3.2 are omitted. |
|
Type of network identification (octet 3.1) |
|
Bits |
|
7 6 5 |
|
0 0 0 |
User specified |
0 1 0 |
National network identification (Note 1) |
0 1 1 |
International network identification |
All other values are reserved. |
|
Note 1 - In the case that "type of network identification" is coded as 010, "national network identification", "national identification plan" is coded according to national specification. |
|
Network identification plan (octet 3.1) |
|
Bits |
|
4 3 2 1 |
|
0 0 0 0 |
Unknown |
0 0 0 1 |
Carrier Identification Code (Note 2) |
0 0 1 1 |
Data network identification code (Recommendation X.121 [21]) |
All other values are reserved. |
|
Note 2 - Carrier Identification Codes may be an appropriate method of identifying the network serving the remote user. |
|
Network identification (octets 3.2, etc.) |
|
These IA5 characters are organized according to the network identification plan specified in octet 3.1. |
|
Network-specific facilities (octets 4, etc.) |
|
This field is encoded according to the rules specified by the identified network. |
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