Rich Communication Services (RCS)

Rich Communication Services (RCS) is a communication protocol between mobile telephone carriers and between phone and carrier, aiming at replacing SMS messages with a text-message system that is richer, provides phonebook polling (for service discovery), and can transmit in-call multimedia. It is part of broader IP Multimedia Subsystem. It is also marketed as Advanced Messaging, Chat, joyn, SMSoIP, Message+ and SMS+.

Melrose Labs RCS Messaging
Melrose Labs RCS Messaging/RCS Business Messaging
Melrose Labs RCS Messaging/RCS Developer Tools