SAP Function Module search on IST_T
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IST_TCTEL_ALLOC_TELNR_ABORT - Cancel
IST_TC_COMMIT - Execute Commit
IST_TC_IBASE_DELETE - Delete IBase (Connection)
IST_TC_IBASE_GET - Get IBase (using GUID for a Telephone Number)
IST_TC_IBASE_PHONENUMBER_ADD - Add Telephone Number(s) to Connection
IST_TC_IBASE_PHONENUM_GET_ALL - Get All Telephone Numbers for a Connection
IST_TC_IBASE_PHONENUM_REMOVE - Delete Telephone Number(s) From Connection
IST_TC_MEMORY_CLEAR - clear memory
IST_TC_MEMORY_IS_LOCKED - return lock status
Return Table index