Hello,
 
I have an iPhone/Android/Windows 8 based UAC, proxy server Kamailio and Sip server FreeSwitch.
Whenever I call directly from UAC to Sip server, the call gets established for as long as I want, however when I use the proxy in between, it gets disconnected within 30 seconds. It seems that FS sends a BYE within 30 seconds.
 
I would really appreciate if anybody please guide me where I am going wrong in this case ?

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Warm Regds.
MathuRahul