Hello,

According to  iPhone Application Programming Guide document,

In order for your application to maintain a persistent connection while it is 
in the background, you must configure the sockets used to communicate with your 
VoIP service. In iPhone OS, most sockets are managed using higher-level 
constructs such as streams. As a result, configuration of a socket to support 
VoIP occurs through the higher-level interfaces. The only thing you have to do 
beyond the normal configuration is add a special key that tags the interface as 
being used for a VoIP service.

I have another question, what can I do for VOIP app with socket implementation 
uses BSD udp sockets to support iOS backgrounding?

I am confused, I don't know where to start. I have a voip app that uses pjsip. 
Any advice and help are very appreciated! :)


Regards,
Angie
                                          
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