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Some questions about jingle

When I use the spark to talk to others ,I found that when we all in interNET,we can not get connection.

I think this is maybe cause by the stun,am I right?If I’‘m right ,how could I set the stun?And is the stun must use the public server in the internet? If I’'m not right,How can I solve the problem to get connection to others?

thank you very much for your help!