On Sat, May 16, 2020 at 10:58 AM Michael Maier <[email protected]> wrote:
> On 15.05.20 at 14:31 Doug Lytle wrote: > > Google says Round Trip Time > > > > https://www.voip-info.org/asterisk-rtcp/ > > That doesn't answer my question (I know the abbreviation RTT). Therefore > I'm trying again: > > I'm just wondering what the RTT *exactly* means. Where are the exact > measuring points located? > > => How are the RTT values exactly calculated? Which values are actually > used for? > The value is calculated according to the logic in the RFC[1]. Specifically using embedded timestamps in the RTCP packets and calculated delays. The value is presented in seconds I believe in the output. > => What about the processing time between the inbound leg and the outbound > leg (transcoding, ...)? > That has no impact within this, since it's calculated using the RTCP traffic which is not used for media. It's really just for round trip time of a UDP packet, not for end to end time of a single audio packet/frame through the system. [1] https://tools.ietf.org/html/rfc3550 -- Joshua C. Colp Asterisk Technical Lead Sangoma Technologies Check us out at www.sangoma.com and www.asterisk.org
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