The TCAP task provides the following services on behalf of applications:
Multiple outstanding transactions per application/subsystem number
Assembling of application components (operation invokes and replies) and parameters into TCAP messages
Association of replies with invokes
Optional timing for replies to invokes (ITU-T only)
Handling of abnormal conditions: protocol errors, timeouts, aborted transactions
Use of ITU-T standard TCAP with ANSI-standard MTP/SCCP stack and vice versa
The TCAP task uses the SCCP connectionless transport service. The TCAP task also makes the following SCCP layer services available to the application:
Addressing by point code/subsystem number and/or global title
Subsystem and point code status change indications
Replicated subsystems with coordinated state change