Are you sure the xlite phone is configured to accept inbound TCP?<br><br>The CallManager by default sends outbound TCP only. In CallManager you can try changing the SIP Profile (or maybe it's security profile) associated with the xlite phone to use UDP for the outbound protocol.<br>
<br>The only other reasons I can think of for the PC to reject the inbound SYN from CallManager are a firewall on the PC vlocking TCP 5060, or the xlite client is listening on another port.<br><br><br><div class="gmail_quote">
On Tue, Jun 2, 2009 at 6:48 AM, Alan Su <span dir="ltr"><<a href="mailto:cj.alan@gmail.com">cj.alan@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>Dear All,</div>
<div> </div>
<div>I'm having a problem to make call from IP Phone registered in CCM6 to SIP phone (X-lite) registered in OnDO.</div>
<div> </div>
<div>Topology:</div>
<div>IPPhone -- CCM6 <-- SIP Trunk --> OnDO -- XLite</div>
<div> </div>
<div>All devices are in the same network segement.</div>
<div> </div>
<div>When I make a call from XLite to IPPhone, it works. But when I tried to make call from IPPhone to XLite, it just returned busy tone. I use Ethereal in OnDO server to capture packets, it did receive the packet from CCM6. The flow as below:</div>
<div> </div>
<div>1. (source) CCM6, (destination) OnDO, (protocol) TCP, (info) 38988 > sip [SYN] seq=0 win=5840 len=0 mss=1460 tsv=612823 tser</div>
<div>2. (source) OnDO, (destination) CCM6, (protocol) TCP, (info) sip > 38988 [RST, ACK} seq=1 ack=1 win=0 len=0</div>
<div> </div>
<div>Any suggestion would be very grateful, thanks a lot~</div>
<div> </div>
<div>Regards,</div>
<div>Alan</div>
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<br></blockquote></div><br>