RFC 2833 End Packets

When the Oracle® Enterprise Session Border Controller, generates RFC 2833 telephone-event packets, they are forwarded from the egress interface every 50 ms by default. Each packet includes the digit and the running total of time the digit is held. Thus DTMF digits and events are sent incrementally to avoid having the receiver wait for the completion of the event.

At the conclusion of the signaled event, three end packets stating the total event time are sent. This redundancy compensates for RTP being an unreliable transport protocol.

You can configure your Oracle® Enterprise Session Border Controller, to generate either the entire start-interim-end RFC 2833 packet sequence or only the last three end 2833 packets for non-signaled digit events using the rfc2833-end-pkts-only-for-non-sig parameter. If the parameter were enabled, the RFC 2833 telephone-event packets for the same event would appear are represented by the following graphic.