| Structure
of SS7 ISUP message |
| Level 3
signalling message in SIF (Signalling Information Field) |
| Routing
label |
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| MTP
ISUP message: |
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| SLS – 4 bit |
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| CIC – 12 bit |
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| Max 256 + 1 octets |
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| CIC |
| SLS |
| OPC |
| DPC |
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| ITU-T
structure |
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| ANSI
=> different |
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| OpP |
| MaVP |
| MaFP |
| MTC |
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| MTC: Message Type Code
(name of ISUP message) |
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| MaFP: Mandatory
Fixed Part (no LI, no parameter names required) |
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| MaVP: Mandatory
Variable Part (LI, no parameter names required) |
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| OpP: Optional
Part (LI and parameter names required) |
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