RCS VoLTE Interoperability Event 2012

The MultiService Forum (MSF), European Telecoms Standards Institute (ETSI) and GSM Association (GSMA) organized a RCS VoLTE Interoperability Event 2012 focused on validating core network interfaces to ensure multi-vendor deployment strategies for RCS and VoLTE technology. The event endorsed and tested a number of GSMA PRDs and validated the Testing Scenarios developed by MSF and ETSI to facilitate multi-vendor deployment of LTE/EPC/IMS technology for RCS and VoLTE services. The event built on the major success of the previous MSF VoLTE Interoperability Event that took place during September 2011.

The event was hosted by China Mobile Research Institute in Beijing, China and the SINTESIO facility in Kranj, Slovenia, co-hosted by Telekom Slovenia. It took place over the period of September 24 to October 12, 2012. Dates varied by location. In addition, remote participation in the IOT event was permitted governed by specific guidelines. 


The workshop, Next Generation Services- RCS, VoLTE and Beyond, was held the 10 & 11 October, 2012 at the Sintesio Facility in Kranj, Slovenia. It was chaired by Giulio Maggiore of Telecom Italia, and chair of ETSI TC INT. The Workshop provided presentations on RCS & VoLTE deployment scenarios, test specifications used for the interoperability event, as well as initial feedback/results from the event. Delegates had an opportunity to visit the interoperability event itself.


The event focused on RCS & VoLTE in the following scenarios:

  • Home/Single Network: In this scenario a single instance of the RCS VoLTE architecture will be created using components from different vendors. Testing will include attachment and detachment from the network, Tracking Area Update, IPCAN session establishment, SIP registration (to IMS), SIP session establishment, interaction with IMS Multimedia Telephony, IMS Conversational Video Services and RCS services. This scenario focuses on testing interoperability of the functionality as profiled by GSMA PRDs IR.92, IR.94, IR.90, IR.67 and the RCS Services and Client Specification.
  • Roaming & Interconnect: In this scenario, the local breakout model with visited P-CSCF and home operator applications is tested. The test set will be the same as for the home/single network case, plus some roaming specific tests to demonstrate the transfer of Policy Rules between home/visited networks, the usage of Diameter Routing Agents, and Session Border Controllers. This scenario focuses on testing interoperability of the functionality as profiled by GSMA PRDs IR.65, IR 88, IR.92, IR.94, IR.90, IR,67 and the RCS Services and Client Specification. In addition, an IPX provides the interconnect network between the 2 PLMNs.

The event also tested:

  • Non-LTE Access: In this scenario, the ‘legacy’ 3GPP access types of UMTS (UTRAN) and GSM/EDGE (GERAN) are used to interface to the EPC. The test set will include attachment, IMS registration and IMS session establishment and teardown.
  • Handover: This scenario builds on the previous one and tests the a number of handover scenarios. This will include intra-LTE handover (between eNodeBs, MME/S-GW relocation) and handover between LTE and legacy 3GPP (UMTS, GSM/EDGE) access.
  • Inter-RAT Priority Call Handover: In this scenario the handover of priority voice calls between LTE and other RATs is tested. The scenario tests that voice calls originating as Multimedia Priority Service (MPS) VoLTE calls have relevant priority markings mapped properly when those calls are handed over to another Radio Access Technology (RAT) and the CS-domain and vice versa.