<div dir="ltr">Dear All,<div><br></div><div>I have a FS production deployment:</div><div>- A FS server behind a NAT network</div><div>- User can register and make calls via internet.</div><div><br></div><div>It have worked well more than 2 years, but it took problem now:</div>
<div><br></div><div>Assume I have following cases:</div><div>1. Phone number in PSTN call to Extension in my branch</div><div>2. Extensions from another branch call to Extension in my branch (via sip trunk)</div><div>3. An extension in my branch call to another extension in my branch</div>
<div>4. An extension in my branch call to a phone number in PSTN </div><div>5. An extension in my branch call to a an extension in another branch (via sip trunk)</div><div><br></div><div>These are results:</div><div>Cases 1. 2. and 3.: Caller heard well but sometime Calleed can't heard from caller. If i wait for a longer time (may be 1 minutes, 2 minutes...) Calleed might heard from Caller.</div>
<div>Cases 4.5: Both Caller and Calleed heard well.</div><div><br></div><div>I have captured PCAP file on FS server, I saw that there were no different between cases 1,2,3 and case 4,5. I have seen many packets that FS server send to calleed IP.</div>
<div><br></div><div>There are only one change to my branch network. Network administrator make a NAT (80 and 8000) for camera service at public interface to a private IP in my branch network.</div><div><br></div><div>My question is: why Calleed in case 1, 2, 3 can not heard from caller ?</div>
<div style><br></div><div>Another question: FS use RTP for carrying out voice/video but I can only see about 11 RTP packets (for one direction), but there are too many UDP packets in call session. I have attached the picture for that.</div>
<div><br></div><div style>In the picture:</div><div style><a href="http://113.161.90.103">113.161.90.103</a>: public ip address in my branch</div><div style><a href="http://192.168.45.4">192.168.45.4</a>: FS server private ip behind NAT</div>
<div style><a href="http://10.12.10.140">10.12.10.140</a>: My AudioCodes Phone's private IP in my branch </div><div>Thanks in advance for your help.<br clear="all"><div><br></div>-- <br>Best regards,<br>-------------------------------------------------------------------------------------------------------------<br>
EM NGUYEN</div><div>Website: <a href="http://freeswitch.vn">http://freeswitch.vn</a> <br>Mobile: +84 949669075<br>Yahoo & Skype: nghiaembt<br>--------------------------------------------------------------------------------------------------------------
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