I have just seen such a case and it was caused by UDP retransmission.

-----Original Message-----
From: Scott Lawrence [mailto:[email protected]] 
Sent: 01 December 2009 13:14
To: Wen Jun
Cc: [email protected]
Subject: Re: [sipx-users] Why there are 2 SIP INVITE in a call to called
party

On Tue, 2009-12-01 at 17:48 +0800, Wen Jun wrote:
> Hi, I have no idea why there are 2 SIP INVITE from SIPX to called
> party in a call. Is there any specific reason for that ?

There could be several reasons.

In any event, it should not cause a problem, since the recipient can
detect that they are the same and return a loop detected error for one
of them.




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