1. Essentials Guide
  2. Oracle USM Supporting the IMS Edge
  3. IR.94 Support

IR.94 Support

The Oracle Communications Unified Session Manager supports IR.94 (IMS Profile for Conversational Video Service) for use in an IMS and LTE environment.

The Oracle Communications Unified Session Manager supports both video and audio and can keep a call up by switching to audio mode when the video session is dropped. The Oracle Communications Unified Session Manager receives a Specific-Action AVP in the RAR from the PCRF indicating the loss of video bearer. The Oracle Communications Unified Session Manager then replies with a RAA, and finally sends a STR failing the call.

This behavior contradicts TS 29.214 that indicates the P-CSCF should wait for an ASR from the PCRF (indicating the bearer has been removed), and should not fail the call until all bearers have been removed.

The following behaviors enable IR.94 Support:

  • The Oracle Communications Unified Session Manager supports the IR.94 re-INVITE procedures for adding or removing video mid-call.
  • The Oracle Communications Unified Session Manager recognizes that a UE is capable of handling video calls when in the REGISTER message, the sip.video media feature is present in the Contact: header.
  • The Oracle Communications Unified Session Manager supports Audio-Video Profile with Feedback (AVPF) and SDP Capability Negotiation (RFC 5939) as documented in TS 26.114 section 6.2.1a.
  • When the Oracle Communications Unified Session Manager supports sessions (200 OK received after an INVITE) with a single media stream throughout the session duration, it may receive any of the following notifications in the Specific-Action AVP of the RAR from the PCRF:
    • INDICATION_OF_LOSS_OF_BEARER (2)
    • INDICATION_OF_RELEASE_OF_BEARER (4)
    • INDICATION_OF_OUT_OF_CREDIT (7)
    • INDICATION_OF_FAILED_RESOURCES_ALLOCATION (9)

    The Oracle Communications Unified Session Manager then:

    1. Replies with an RAA acknowledging the RAR
    2. Sends a BYE to both the UE and the Core, then
    3. Sends an STR to the PCRF indicating the session has been terminated.
  • When the Oracle Communications Unified Session Manager supports sessions (200 OK received after an INVITE) with multiple simultaneous media streams sometime during the session, it may receive any of the following notifications in the Specific-Action AVP of the RAR from the PCRF:
    • INDICATION_OF_LOSS_OF_BEARER (2)
    • INDICATION_OF_RELEASE_OF_BEARER (4)
    • INDICATION_OF_OUT_OF_CREDIT (7)
    • INDICATION_OF_FAILED_RESOURCES_ALLOCATION (9)

    The Oracle Communications Unified Session Manager then:

    1. Sends an RAA acknowledging the RAR, and no further action is required When an eSR-VCC handover occurs, the ATCF (Oracle Communications Unified Session Manager) sends a INVITE/UPDATE without video (voice-only SDP) toward the target UE.