Copyright 2010-2015 Obihai Technology, Inc.
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ITSP Driven Distinctive Ringing
The OBi device offers 10 ring and 10 call-waiting tone patterns in each ring profile. These patterns are numbered from 1
to 10. Each pattern also comes with a configurable name. A different default ring may be assigned to each trunk on the
device.
An ITSP can instruct the OBi device which ring to use (by name) for a call routed to SP
n
by inserting an Alert-Info header
in the SIP INVITE sent to the device. The Alert-Info must include a URI. For example:
Alert-Info:
http://www.xyz.com/some-folder/bellcore-dr4
When the device receives this, it will look for a ring tone name or call-waiting tone name in the ring profile that
matches the Alert-Info URI. Ring tone names are not case sensitive when compared. If a match is found, the device
plays the corresponding ring or call-waiting tone. Otherwise, the device plays the default ring.
RTP Statistics – the X-RTP-Stat Header
When ending an established call, the OBi device can include a summary of the RTP statistics collected during the call in
the SIP BYE request or the 200 response to the SIP BYE request sent by the peer device. 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]
For example:
X-RTP-Stat:PS=1234,OS=34560,PR=1236,OR=24720,JI=1,DU=1230,PL=0,EN=G711U, DE=G711U
To enable the X-RTP-Stat feature, the parameter
ITSP Profile X – SIP
::
X_InsertRTPStats
must be set to
true
.
RTCP
The OBi1000 supports RTCP-XR. Available statistics are:
-
Jitter
-
VQMON
Media Loopback Service
The OBi supports the media loopback draft as described in
draft-mmusic-media-loopback-13.txt
. The following media
loopback features are supported by the OBi device:
-
Loopback modes: loopback-source and loopback-mirror
-
Loopback types: rtp-media-loopback and rtp-packet-loopback
-
Loopback packet formats:: encaprtp, loopbkprimer
