The summary is carried in an X-RTP-Stat header in the form of a comma-separated list of fields. The
reported fields are:
● PS = Number of Packets Sent
● PR = Number of Packets Received
● OS = Number of bytes sent
● OR = Number of bytes received
● PL = Number of packets lost
● JI = Jitter in milliseconds
● LA = Decode latency or jitter buffer size in milliseconds
● DU = Call duration in seconds
● EN = Last Encoder Used
● DE = Last Decoder Used
● MOS = Mean Opinion Score
For example:
X-RTP-
Stat:PS=1234,OS=34560,PR=1236,OR=24720,JI=1,DU=1230,PL=0,EN=G711U,DE=G711U,MOS=4.0
To enable the X-RTP-Stat feature, set the
ITSP Profile X - SIP
::X_InsertRTPStats parameter to YES
(or TRUE).
Media Loopback Service
The device supports the media loopback draft as described in
draft-mmusic-media-loopback-13.txt
.
The device supports the following media loopback features:
● Loopback modes: loopback-source and loopback-mirror
● Loopback types: rtp-media-loopback and rtp-packet-loopback
● Loopback packet formats: encaprtp, loopbkprimer
When the device acts as a loopback mirror, it always sends primer packets so that incoming packets
can get through NAT/Firewall. The media loopback feature is controlled by the following parameters
(in the
PHONE Port - Calling Features
section):
● AcceptMediaLoopback - Enable device to accept incoming call that requests media loopback.
Default is YES.
● MediaLoopbackAnswerDelay - The delay in ms before the device answers a media loopback call.
Default is 0.
● MediaLoopbackMaxDuration - The maximum duration to allow for an incoming media loopback
call. Default is 0, which means the duration is unlimited.
78
Chapter 12Service Providers
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