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When a Real-time Transport Protocol (RTP) program or Microsoft Windows Messenger receives an RTCE_MEDIA event, the get_EventReason property returns the following reason code:
The RTP feature of Real-time Communications (RTC) requires regular Real-time Control Protocol (RTCP) packets. Packets must be received at least every forty seconds, but more frequently is better. If the RTP feature does not receive an RTCP packet at least every forty seconds, RTP sends the program an RTCE_MEDIA event that has the RTC_MEDIA_EVENT_REASON property set to RTCMER_TIMEOUT.
This might also occur with third-party Session Initiation Protocol (SIP) stacks. For example, an SIP server can migrate a call from one endpoint such as another RTC program to a Multipoint Control Unit (MCU) server. Therefore, there are two RTP streams that are identified by two different Synchronization Source (SSRC) identifiers in each RTP stream. When this behavior occurs, one of the RTP streams times out.