Even if the IMS (IP Multimedia Subsystem) history still goes on, we can already see similarities with the Iliad and the Odyssey. In Homer's poems, Odysseus went to war for 10 years, and spent another 10 years fighting the gods to return home.

IMS, on its side, started in the early 2000's, when the 3GPP chose the SIP protocol as the foundation for a new core network architecture.

Will the story of IMS, which return to Ithaca would be its common deployment, last also 20 years? And what are the remaining paths to success?