H.323 to H.323 Negotiation

The Oracle® Enterprise Session Border Controller serves as the H.323 called gateway. It answers RFC 2833 audio telephony event capability in the version 4 H.323/H.245 TCS when it receives a call from an H.323 endpoint configured for preferred RFC 2833.

If the Oracle® Enterprise Session Border Controller is the answering device, configured for preferred support, and the calling device sends 2833, the Oracle® Enterprise Session Border Controller accepts the 2833 regardless of the next-hop’s DTMF capabilities. The received dynamic RTP payload type is used for detecting 2833 packets, while the response dynamic payload type is used for generating 2833 packets.

The Oracle® Enterprise Session Border Controller supports:

• RFC-2833 audio telephony events in the version 4 H.323/H.245 TCS as the H.323 calling gateway, when the Oracle® Enterprise Session Border Controller calls an H.323 endpoint configured for preferred RFC 2833 support. The Oracle® Enterprise Session Border Controller sends 2833 to the called party regardless of whether the calling party sends it.
• H.245 UII and RFC-2833 packets sent at the same time, to the same endpoint, even if only half of the call is being provided 2833 support by the Oracle® Enterprise Session Border Controller.

  If one half of the call supports H.245 UII, and the other half is being provided 2833 translation by the Oracle® Enterprise Session Border Controller, the Oracle® Enterprise Session Border Controller can also forward the H.245 UII it receives to the 2833 endpoint. For example, when the signaling goes through a gatekeeper or third party call control, sending the H.245 UII in the signaling path allows those devices to learn the DTMF digits pressed.