Rich Communication Services

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Rich Communication Services
Developer(s) GSM Association
Initial release 2012
Development status Active
Operating system Apple iOS, Android, Windows 10 Mobile
Available in Multilingual
Type Instant Messaging
License Proprietary software

The Rich Communication Services program is a GSM Association (GSMA) program for the creation of inter-operator communication services based on IP Multimedia Subsystem (IMS).[1][2][3] It is marketed by the GSMA under the brand name joyn.[4]

Key features of RCS include:

  • Enhanced Phonebook: service capabilities and enhanced contacts information such as presence and service discovery.
  • Enhanced Messaging: enables a large variety of messaging options including chat, emoticons, location share and file sharing.
  • Enriched Calls: enables multimedia content sharing during a voice call, video call and screen sharing.


The Rich Communication Suite (RCS) industry initiative [5] was formed by a group of leading industry players in 2007. In February 2008 the GSMA officially became the project ‘home’ of RCS and an RCS Steering Committee was established by the organisation.

The scope of the RCS Steering Committee’s work was to entail the definition, testing and integration of the diverse services in the application suite known as RCS. Some three years later, the RCS project released a new specification – RCS-e (e = ‘enhanced’), which included various iterations of the original RCS specifications. The GSMA programme is now called Rich Communication Services.[6]

RCS specifications[edit]

RCS takes on board different services defined by e.g. 3GPP and Open Mobile Alliance (OMA) and combines them with the Enhanced Phonebook. This allows the service capabilities as well as presence information of the different recipients to be shown in the terminal phonebook application.

RCS reuses the capabilities of 3GPP specified IMS core system as the underlying service platform taking care of issues such as authentication, authorization, registration, charging and routing.

Five releases of the RCS specifications have been made to date. Each release expanded the scope of its predecessor.

Release 1
Offered the first definitions for the enrichment of voice and chat with content sharing, driven from an RCS enhanced address book.
Release 2
Added broadband access to RCS features: enhancing the messaging and enabling sharing of files.
Release 3
Focused on the broadband device as a primary device.
Release 4
Included support for LTE.
Release 5
The most recent release, global interoperability is a key aspect of these specifications.

The following standardized services are a part of the specifications of RCS:[7]

joyn specifications[edit]

The GSMA has defined a series of joyn specifications that define specific implementations of the underlying RCS specifications. The RCS specifications often define a number of options for implementing individual communications features, resulting in challenges in delivering interoperable services between carriers. The joyn specifications aim to define a more specific implementation that promote standardisation and simplify interconnection between carriers.

At this time there are two major relevant releases:

  • joyn Hot Fixes - based upon the RCS 1.2.2 specification (previously known as RCS-e), this includes 1:1 chat, group chat, MSRP file sharing and video sharing (during a circuit switched call). Services based upon this specification are live in Spain, France and Germany.
  • joyn Blackbird Drop 1 - based upon the RCS 5.1 specification, this extends the joyn Hot Fixes service to include HTTP file sharing, location sharing, group file sharing, and other capabilities such as group chat store and forward. joyn Blackbird Drop 1 is backward compatible with joyn Hot Fixes. Vodafone Spain's network is accredited for joyn Blackbird Drop 1, and Telefónica and Orange Spain have also been involved in interoperability testing with vendors of joyn Blackbird Drop 1 clients. A number of client vendors are accredited to joyn Blackbird Drop 1.

Two or more future releases are planned:

  • joyn Blackbird Drop 2 - also based upon the RCS 5.1 specification, this will primarily add IP voice and video calling. The test cases for joyn Blackbird Drop 2 have yet to be released by the GSMA.
  • joyn Crane - this specification has yet to be released.


According to GSMA PR, Rich Communication Services (RCS) carriers from the around the globe supporting the RCS standard include AT&T, Bell Mobility, Bharti Airtel, Deutsche Telekom, KPN, KT Corporation, LG U+), Orange, Orascom Telecom, Rogers Communications, SFR, SK Telecom, Telecom Italia, Telefónica, TeliaSonera, Telus, Verizon and Vodafone.[8] There is however very little evidence in the field that RCS has wide (or even any) uptake in the market.


Operator Country Launch date Note
Vodafone  Spain 2012 [9] Launched the beta version of RCS at beginning of 2012, branded as joyn.
Movistar  Spain June 2012 [9] Branded as joyn.
Vodafone  Germany August 2012 [9][10] First Branded as joyn. Since November 2013 Message+.
Orange  Spain November 2012 [9] Branded as joyn.
MetroPCS  United States November 2012 [9] Branded as joyn.
KT  South Korea December 2012 [9][11] Branded as joyn.
LG U+  South Korea December 2012 [9][11] Branded as joyn.
SK Telecom  South Korea December 2012 [9][11] Branded as joyn.
Deutsche Telekom  Germany February 2013 [9] Branded as Message+[12]
Telcel  Mexico February 2013 [9] Branded as joyn.
Claro  Argentina May 2013 [9] Branded as joyn.
Claro  Colombia May 2013 [9] Branded as joyn.
Claro  Peru May 2013 [9] Branded as joyn.
Orange  France June 2013 [9] Branded as joyn.
Claro  Brazil August 2013 [9] Branded as joyn.
Claro  Ecuador August 2013 [9] Branded as joyn.
Sprint  United States October 2013 Launched as a separate application[9][13]
Vodafone  Albania April 2014 [14] Branded as Message+.
Telekom  Romania June 2014 [15][16] Branded as joyn.
Slovak Telekom  Slovakia June 2014 [15][16] Branded as joyn.
O2  Germany 2015 [17] Branded as Message+Call.
T-Mobile US  United States July 2015 [18] Branded as Advanced Messaging.
MTS  Russia December 2015 [19] Branded as MTS Connect.
Vodafone  Portugal [20] Branded as Message+.

GSMA RCS accreditation[edit]

The RCS Interop and Testing (IOT) accreditation process [21] was started by the GSMA in order to improve the quality of testing, increase transparency, drive scale, minimize complexity and accelerate time-to-market (TTM) of joyn services. Companies need to undertake the IOT process from the GSMA to apply for a license to use the service mark joyn.

"Accredited" means that the device, client or network has undertaken a series of test cases (150 to 300) in a specific set of conditions, provided test results and traces that have been analysed by the GSMA RCS IOT team and any IOT issues arising resolved with the submitter.[22]

"Accreditation Ready" is the designation awarded to a hosted RCS service that has undertaken the same series of test cases as mobile network operator operator, provided test results and traces that have been analysed by the GSMA RCS IOT team and any IOT issues arising resolved with the submitter. This designation is used to allow operators to identify hosted solutions that will allow them to be become "Accredited" rapidly.[22]


  1. ^ "Rich Communications". GSMA. Retrieved 7 March 2013. 
  2. ^ "Strategic Rationale". GSMA. Retrieved 7 March 2013. 
  3. ^ Operators, Ecosystem & Hosted Solutions | Network 2020
  4. ^ "About joyn". GSMA. Archived from the original on 29 January 2013. Retrieved 7 March 2013. 
  5. ^ Joyn, un servicio de mensajería instantánea limitado a las operadoras móviles -
  6. ^ "Rich Communications – past, present & future". GSMA. Archived from the original on 2012-05-23. Retrieved 18 October 2012. 
  7. ^ "RCS Specifications". GSMA. Archived from the original on 2013-03-28. Retrieved 18 October 2012. 
  8. ^ "Mobile Operators Show Increased Momentum In Rich Communications". PR Newswire. Retrieved 27 February 2012. 
  9. ^ a b c d e f g h i j k l m n o p q "RCS Fact October 2013" (PDF). GSMA. 2013-10-29. Retrieved 2014-03-09. 
  10. ^ "WhatsApp-Konkurrent: Vodafone startet mit Message+" (in German). teltarif. 2013-11-08. Retrieved 2014-04-28. 
  11. ^ a b c "Korean operators launch joyn service". Telecompaper. 27 December 2012. Retrieved 27 December 2012. 
  12. ^
  13. ^ "Sprint goes OTT with 'Messaging Plus' app from Jibe". FierceWireless. 2013-10-14. Retrieved 2014-03-09. 
  14. ^ "Vodafone Albania introduces monthly bundle, Message+". Telecompaper. 2014-04-28. Retrieved 2014-04-28. 
  15. ^ a b "Jibe Mobile powers Deutsche Telekom joyn expansion in Romania and Slovakia" Fierce Wireless. 2014-06-30. Retrieved 2014-07-02.
  16. ^ a b "Cosmote Romania, Slovak Telekom launch Joyn apps". Telecompaper. 2014-06-30. Retrieved 2014-06-30. 
  17. ^ "Die neue O2 Message+Call App: Jetzt mit dem Smartphone im WLAN telefonieren" (in German). o2 Germany. 2015-08-11. Retrieved 2015-11-26. 
  18. ^ "Announcing Advanced Messaging. Only at T-Mobile". T-Mobile. Retrieved 22 July 2015. 
  19. ^ "MTS Connect". MTS. Retrieved 25 December 2015. 
  20. ^ "Vodafone Message+". 
  21. ^ GSMA Accreditation and Certification by Global Certification Forum (GCF) | Network 2020
  22. ^ a b "GSMA RCS Interop and Testing". GSMA. Archived from the original on 2012-10-12. Retrieved 18 October 2012. 

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