Help WINCE 7.0 MC32N0 and built-in PTT client?

Is there a simple walk through for this setup, except the Integration guide which does not show any real examples, and for a person who has just started to understand SIP and VOIP as a whole it is hard to use the given awesome feature.

 

* i did not change any config

* i just installed the client, it connected to the WiFi (5ghz) and the Succesfull connect(online) sound was played

 

but after that i'm lost, tried to ommunicate with 2 devices no luck.