Opened 6 years ago

Last modified 6 years ago

#2124 new defect

Separate DTLS-SRTP negotiation for RTP and RTCP

Reported by: nanang Owned by: nanang
Priority: normal Milestone: release-2.10
Component: pjmedia Version: trunk
Keywords: Cc:
Backport to 1.x milestone: Backported: no

Description (last modified by nanang)

   RTP and RTCP traffic is usually sent on two separate UDP ports.  When
   symmetric RTP [RFC4961] is used, two bidirectional DTLS-SRTP sessions
   are needed, one for the RTP port, one for the RTCP port.  When RTP
   flows are not symmetric, four unidirectional DTLS-SRTP sessions are
   needed (for inbound and outbound RTP, and inbound and outbound RTCP).

Currently PJMEDIA only does DTLS-SRTP negotiation for RTP, and there is a report that it may cause no audio issue both ways when communicating with WebRTC (packet capture shows only outgoing RTP traffics).

Thanks Joe Thomas for the report.

Change History (1)

comment:1 Changed 6 years ago by nanang

  • Description modified (diff)
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