2.1 TIF Number Portability Feature

The TIF Number Portability (TIF NP) feature, along with the Numbering Plan Processor (NPP) the Service Portability feature, and the Triggerless ISUP Framework (TIF), provide the following capabilities:

• Complex prefix usage, where prefixes can be used to customize actions
• Non-NAI-compliant digit handling
• Complex outgoing digit formats
• Calling number portability
• Concurrent Release and Relay support
• Circular route prevention (CRP)
• IAM/SAM splitting

The TIF NP feature is built upon the services provided by TIF and NPP to support ISUP messages.

TIF NP provides the following functions:

• Definition of feature-specific pre-NPP processing to be performed by TIF
• Service Action specification (including Service Action names and precedence)
• Service Action Handlers
• Feature-specific post-NPP processing, if needed