Service Providers
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● 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, 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. You can
enable or disable this feature from System Management
> Device Admin > Media Loopback.
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
Device Admin – Media Loopback 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.
The device rejects an incoming media loopback call if:
● Handset port is off-hook.
● Handset port is ringing.
The device terminates an inbound media loopback call already in progress when:
● Handset port is off-hook.
● Handset port is ringing.
To make an outgoing loopback call, dial one of the following star codes before dialing the target number:
● *03 – Make a Media loopback call.
● *04 – Make an RTP packet loopback call.
Note that outbound Media Loopback Call isn’t subject to call duration limit. It lasts until you hang up or until
the called device ends the call.
For more information on general ITSP parameters, see the
ITSP Profile X – General Web Page (X = A, B,
C, D, E, F, G, H) Parameter Guide table in the Parameter Reference section.
For more information on ITSP SIP settings parameters, see the ITSP Profile X – SIP Web Page (X = A, B,
C, D, E, F, G, H) Settings Parameter Guide table in the Parameter Reference section.