Chandan,
You could use RLIA Tasktop edition to sync between JIRA and RTC. However, that solution would assume you want to continue to use both planning tools, and keep the data synchronized between them. RLIA allows you to configure the synchronization mappings in order to translate change requests between the two tools.

However, if what you want to do is migrate from one tool to another, preserving existing data, then you need an ETL script that reads data from the source tool, converts it as needed to be consistent with the target tool, and writes to the target tool. OSLC could certainly do this since it defines a standard way of reading and writing change requests from OSLC Configuration Management providers, and a standard definition of a Change Request item. But there may be other solutions that involve import/export using XML or CSV files.

A google search for Migrating from JIRA to RTC may provide some additional information. In particular, see https://jazz.net/forum/questions/34969/migrate-jira-to-rtc.

 Hello Chandan-