Version 7.2 687 Mediant 800B Gateway & E-SBC
User's Manual 29. SBC Overview
Early Media RTP: The device supports the interworking with remote clients that send
18x responses with early media and whose subsequent RTP is delayed, and with
remote clients that do not support this and require RTP to immediately follow the 18x
response. Some clients do not support 18x with early media, while others require 18x
with early media (i.e., they cannot play ringback tone locally). These various
interworking capabilities are configured by the IP Profile parameters, 'Remote Early
Media RTP Detection Mode', 'SBC Remote Supports RFC 3960', and 'SBC Remote
Can Play Ringback'. See the flowcharts below for the device's handling of such
scenarios:
Figure 29-8: SBC Early Media RTP 18x without SDP
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