Voice chat problem in spark

Hi all,

I have installed openfire as my jabber server and spark as my jabber client.

and the version of jabber client Spark is spark_2_5_8.

I am able to make IM, transfer of files but i am not able to answer the call.

the error is “session cloed due to Closed Remotely” on one side and

on the other side we are getting “Voice chat ended: No Media Recieved. This may be caused by firewall configuration Problems”.

we have tested even disabling the firewall also.

even though same error.

please give me any idea regarding this.

Thank you.

With Regards

Vardhan