<html><head><base href="x-msg://292/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>I'm seeing some *very* puzzling behavior from a bunch of our clients. Basically, the INVITE never makes it to the fone, it looks like the upstream router/modem just swallows it. The weird thing is, tweaking the username slightly resolves the issue, for a while at least. And then, it stops again. Anyone seen anything like this before? Any ideas? Am I missing something ridiculously obvious?</div><div>Fwiw, I've seen this behavior in setups with *no* SIP ALG, and *no* firewall. That said, it really *does* look like a firewalling issue, doesnt it?</div><div><br></div><div>Here is a typical INVITE that is sent out from Kamailio. The username is <i>mahesh.test204</i>. The "fix" is to simply change the name to "mahesh.test205", or "mahesh.test20", or "ahesh.test204", etc. </div><div>Is there something obviously wrong with the INVITE perhaps? Bad format?</div><div><br></div><div><br></div><div><br></div><div><div>INVITE <a href="sip:mahesh.test204@173.101.106.53:5060;rinstance=e2f54e94d29118d7;transport=UDP">sip:mahesh.test204@173.101.106.53:5060;rinstance=e2f54e94d29118d7;transport=UDP</a> SIP/2.0.</div><div>Record-Route: <<a href="sip:74.217.82.147;lr;ftag=X8BN4N8vtXKej;nat=yes">sip:74.217.82.147;lr;ftag=X8BN4N8vtXKej;nat=yes</a>>.</div><div>Via: SIP/2.0/UDP 74.217.82.147;branch=z9hG4bK8e0c.0ded64d5.0.</div><div>Via: SIP/2.0/UDP 74.217.82.232;received=74.217.82.232;rport=5060;branch=z9hG4bK3DtFg45Qetv9F.</div><div>Max-Forwards: 69.</div><div>From: "7732206484" <<a href="sip:2065771035@74.217.82.232">sip:2065771035@74.217.82.232</a>>;tag=X8BN4N8vtXKej.</div><div>To: <<a href="sip:mahesh.test204@a5prodsbc.aptela.com">sip:mahesh.test204@a5prodsbc.aptela.com</a>>.</div><div>Call-ID: 67108c50-1f0d-122e-17b1-001a647938bc.</div><div>CSeq: 382107 INVITE.</div><div>Contact: <<a href="sip:mod_sofia@74.217.82.232:5060">sip:mod_sofia@74.217.82.232:5060</a>>.</div><div>Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE.</div><div>Supported: precondition, path, replaces.</div><div>Allow-Events: talk, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer.</div><div>Content-Type: application/sdp.</div><div>Content-Disposition: session.</div><div>Content-Length: 246.</div><div>Subject: Local.</div><div>Remote-Party-ID: "7732206484" <<a href="sip:2065771035@74.217.82.147">sip:2065771035@74.217.82.147</a>>;party=calling;id-type=subscriber;screen=yes;privacy=off.</div><div>.</div><div>v=0.</div><div>o=FreeSWITCH 1281422601 1281422602 IN IP4 74.217.82.232.</div><div>s=FreeSWITCH.</div><div>c=IN IP4 74.217.82.232.</div><div>t=0 0.</div><div>m=audio 13742 RTP/AVP 0 101 13.</div><div>a=rtpmap:0 PCMU/8000.</div><div>a=rtpmap:101 telephone-event/8000.</div><div>a=fmtp:101 0-16.</div><div>a=rtpmap:13 CN/8000.</div><div>a=ptime:20.</div></div><div><br></div><div><br></div><div><br></div><div><br></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div><span class="Apple-style-span" style="color: rgb(74, 74, 49); font-family: Verdana, sans-serif; "><div><font class="Apple-style-span" face="Calibri" size="4"><span class="Apple-style-span" style="font-size: 15px; "><span class="Apple-style-span" style="font-family: Calibri, sans-serif; "><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(74, 74, 49); ">Mahesh Paolini-Subramanya | CTO | </span><span style="font-size: 8pt; font-family: Verdana, sans-serif; "><a href="mailto:mahesh@aptela.com">mahesh@aptela.com</a> | <span style="color: rgb(74, 74, 49); ">703.386.1500 Ext. 9100</span></span></span></span></font></div><div><font class="Apple-style-span" color="#4A4A31" face="Verdana, sans-serif" size="3"><span class="Apple-style-span" style="font-size: 11px; "><span style="font-size: 8pt; line-height: 12px; font-family: Verdana; color: rgb(74, 74, 49); ">2250 Corporate Park Drive | Suite 150 | Herndon, VA | <span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 15px; line-height: normal; "><a href="http://www.aptela.com/" style="color: blue; text-decoration: underline; "><span style="font-size: 8pt; font-family: Verdana, sans-serif; ">www.aptela.com</span></a></span></span></span></font></div><div><span class="Apple-style-span" style="font-size: 11px; line-height: 12px; "><span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 15px; line-height: normal; "><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(74, 74, 49); ">Check out our</span><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(79, 98, 40); "> </span><span style="font-size: 8pt; "><a href="http://www.aptela.com/blog" style="color: blue; text-decoration: underline; "><span style="font-family: Verdana, sans-serif; ">Blog</span></a></span><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(79, 98, 40); "> </span><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(74, 74, 49); ">|</span><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(79, 98, 40); "> Follow us on </span><span style="font-size: 8pt; "><a href="http://twitter.com/Aptela" style="color: blue; text-decoration: underline; "><span style="font-family: Verdana, sans-serif; ">Twitter</span></a></span><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(79, 98, 40); "> </span><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(74, 74, 49); ">|</span><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: rgb(79, 98, 40); "> Refer a </span><span style="font-size: 8pt; "><a href="http://www.aptela.com/referral" style="color: blue; text-decoration: underline; "><span style="font-family: Verdana, sans-serif; ">Friend</span></a></span></span> </span></div></span></div></span><br class="Apple-interchange-newline"><span></span><span></span><span><img height="26" width="81" id="e0e6e51e-f0fc-4177-9ff8-0b8d5f4c50de" apple-width="yes" apple-height="yes" src="cid:image003.jpg@01CA1749.C3820510"></span>
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