Hello all,<br><br>Actually i have openser box which i used to make <br>calls among my offices which spread different<br>geographical places.<br><br>i am using in the configuration file just to make<br>changes to my rtp packets so without RTPPROXY 
<br>and MEDIAPROXY modules i was able to make calls<br>even my end UAC are behind NAT.<br><br>but if i want to control my media between different<br>UAs like a prepaid system as we used to see in case of<br>mobile prepaid system which stops you from continuing your 
<br>call when there was no balance left on ur mobile .<br><br>can anybody give me a hint how can i do that ?<br>if so what architecture it needs like any mediaproxy?<br><br>will session border controller help me out?<br>
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just give me a hint so that i can go ahead <br><br>thanks once again <br clear="all"><br>-- <br>Srinivas Antarvedi<br>