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RTC Version 1.0 delivered basic SIP-based real-time communications functionality for the development of content-streaming client applications.
RTC Version 1.01 provides extensions for the application to provide IP port and address mappings for clients situated behind a Network Address Translator (NAT).
RTC Version 1.2 offers the following functional additions on top of the 1.0 specification:
- Improved multiple service connection support.
- SIP-based user search behaviors.
- Support for logical buddy groupings.
- Support for contact roaming behavior. Roaming functionality is a SIP extension, and not a component of standard SIP services.
- Support for event handling of the SIP INFO request.
- Support for custom presence properties.
- Support for ACL-based contact access.
RTC Version 1.3 adds the following features to version 1.2:
- Enhanced MPOP support.
- Additional client security options.
- Marshalling support.
- Support for new Microsoft® Office Live Communications Server features.