[OpenSIPStack] Question abotu resending registration to sip

[tomach <to...@dg...>]

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Hello guys I need help,
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I try to describe my problem:
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My softphone based on atlsip is registering to my sipServer, everything works fine. But after about 30-40 minutes it send registering packet again(its good behaviour) but...my sipserver do not recoginse it because there is small difference before first and second register message send by softphone).
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First register:
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Session Initiation Protocol<br />
    Request-Line: REGISTER sip:sipx.dgt.com.pl SIP/2.0<br />
        Method: REGISTER<br />
        Resent Packet: False              &lt;-- this is good here<br />
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    Message Header<br />
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second register:
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Session Initiation Protocol<br />
    Request-Line: REGISTER sip:sipx.dgt.com.pl SIP/2.0<br />
        Method: REGISTER
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        Resent Packet: True          &lt;-----this should be like previous  (False)
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        Suspected resend of frame: 1216   &lt;-----here my sipServer do not recognise it totally and response with out of order
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    Message Header<br />
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So after second regiser message my SIPserver response with out of order and softphone gets unregistered...
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MY quiestion is how to disable it? this information that the packet is resend? I was trying to locate it in codes but couldnt find it....Please any help is appreciate, because now my softphone only works for half an hour...:(
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Best Regards,
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Tom 
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