This obviously is pointing to NAT issue. see if you've configured both asterisk servers with externip= PUBLICIPOFAsterisks.<div><br></div><div>Studying SIP traces on each console and specially looking at the SDPs in INVITE will help you find out exact problem. I expect that one of the asterisk box is sending the audio to its LAN/Private IP whereas it should be sending RTPs to Public IP of other Asterisk.</div>
<div><br></div><div><br></div><div><div class="gmail_quote">On Fri, Sep 16, 2011 at 12:50 PM, Lee, John (Sydney) <span dir="ltr"><<a href="mailto:John.Lee@compuware.com">John.Lee@compuware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><u></u>
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<p dir="LTR"><span lang="en-au"></span><span lang="en-au"><font size="2" face="Courier New">I have been deploying Asterisk (open source PABX) in the company which I work.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">So</font><font size="2" face="Courier New"> far, all the Asterisk servers do not really talk to each other. Recently, I am experimenting to dial from one Asterisk server to another through the WAN and I encountered a no-audio problem although the callee's phone can ring.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">I understand that the no-a</font><font size="2" face="Courier New">udio means that SIP traffic (TCP/UDP 5060) is allowed to go through but not RTP (UDP 16384-32767).</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New"> </font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">Case A</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">======</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">This is a simplified diagram of how I am testing the dialling between 2 subnets.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">In this case, phone A is registered in Asterisk A and phone</font><font size="2" face="Courier New"></font></span><span lang="en-au"></span><span lang="en-au"> <font size="2" face="Courier New">B</font></span><span lang="en-au"></span><span lang="en-au"><font size="2" face="Courier New"> is registered in Asterisk B.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">Phone A <--> Asterisk A <--> Router A <<==>> WAN <<==>> Router B <--> Asterisk B <--> Phone B </font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New"> </font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">Case B</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">======</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">However, before I have tested successfully using this kind of connection.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">In this case, phone B1 and B2 are registered in Asterisk B although they are on different subnets.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">Both phone B1 and B2 can ring and audio is allowed to pass through.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">Phone B1 <--> Router A <<==>> WAN <<==>> Router B <--> Asterisk B <--> Phone B2</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New"> </font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">I am</font> <font size="2" face="Courier New">mystified why audio is allowed go through in case B but not case A.</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New"> </font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">Can someone be kind enough to help me to understand why I have this problem?</font></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">If the router is blocking RTP traffic, then why is that I have no audio problem in case B?</font></span><span lang="en-au"></span><span lang="en-au"></span></p>
<p dir="LTR"><span lang="en-au"><font size="2" face="Courier New">Thanks in advance.</font></span><span lang="en-au"></span><span lang="en-au"></span></p>
<p dir="LTR"><span lang="en-au"></span><span lang="en-au"></span></p>
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