Video call suspend

Hi:

My Openfire env like this:

openfire 3.9.3 on server centos 6.5

spark 2.6.3 on client win7 / win8 , x86_64

redfire redfire-370-0.0.06

The problem is , when I use video call , client will suspend .

Thanks for any advise。 By the way , where can I download spark 2.5.8 ?

www.igniterealtime.org/downloads/download-landing.jsp?file=spark/spark_2_5_8.exe

Thank you very much !

I install spark2.5.8 fix this problem. now , video is perfect, but there is much noise when we talk!