<div dir="ltr"><div>Hi Claus,</div><div><br></div><div>Many thanks for your support. Sorry that my information was not detailed enough.</div><div><br></div><div>We found one of our servers that we can make a video call successfully with the situation mentioned in first email. Maybe there is something changed incidentally in that server. We will continue to investigate and give you more details later.</div><div><br></div><div>Thanks and Regards,</div><div>SonTH</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 9, 2014 at 4:14 PM, Claus Andersen <span dir="ltr"><<a href="mailto:clan@wheel.dk" target="_blank">clan@wheel.dk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<span class=""><br>
On Thu, 9 Oct 2014, To Hai Son wrote:<br>
<br>
> Video calls are performed perfectly with high speed internet connection, but if internet connection speed is<br>
> quite low, we can not see the video, just can hear voice only. We have make an emulation call from PC with low<br>
> speed of internet connection, the same problem occurred.<br>
<br>
</span>You are not giving a lot of factual information here. What codecs are you<br>
using? What resolution and framerate did you expect. How is your call<br>
setup (transcoding etc.)? What is "low" speed.<br>
<br>
H.264 will only consume around 10 kbps with around 2 fps in 176x144. That<br>
is very low quality - but it is better than nothing.<br>
<br>
It could be the endpoint deciding that the bandwidth is too low and then<br>
prioritize the audio and sends no video (nor offers it). What are your end<br>
points?<br>
<br>
Is video even viable in your "low bandwidth" scenario?<br>
<span class=""><br>
> We guess that there is a parameter in FreeSwitch to limit the internet connection, and server does not allow<br>
> video stream if internet connection speed is lower than this parameter. We are newbie to Freeswitch, we do not<br>
> know much about it, so please help us.<br>
<br>
</span>If you are completely new to Freeswitch then I would start by examining<br>
your traffic flow. Are you sure that the video streams flow through<br>
Freeswitch?<br>
<br>
<a href="https://wiki.freeswitch.org/wiki/Proxy_Media" target="_blank">https://wiki.freeswitch.org/wiki/Proxy_Media</a><br>
<a href="https://wiki.freeswitch.org/wiki/Bypass_Media" target="_blank">https://wiki.freeswitch.org/wiki/Bypass_Media</a><br>
<span class=""><br>
> Any advice will be appreciated.<br>
<br>
</span>My advice would be:<br>
- Examine the SIP call flow<br>
- Examine the SDP to determine if video has been agreed upon<br>
- Examine the RTP stream path<br>
- Check call setup log on client (which could be the one throttling!)<br>
- Examine Proxy Media and Bypass media (does Freeswitch even interfere?)<br>
- Look what happens during call setup:<br>
<a href="https://wiki.freeswitch.org/wiki/Sofia#Debugging_Sofia-SIP" target="_blank">https://wiki.freeswitch.org/wiki/Sofia#Debugging_Sofia-SIP</a><br>
<br>
I would spend the most time looking at the logs on the end-points. What<br>
codecs where negotiated and is video even sent?<br>
<br>
In all logs I would pay paticular attention to the results of of the SIP<br>
INVITE and the SDPs. The SDP will tell you what options are offered and<br>
accepted.<br>
<br>
Kind Regards,<br>
Claus Andersen<br>
<br>
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</blockquote></div><br></div>