<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 04 Apr 2016, at 10:02, Grant Bagdasarian <<a href="mailto:gb@cm.nl" class="">gb@cm.nl</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class="">Hi Daniel,<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="color: rgb(31, 73, 125);" class="">You mentioned below about this issue not being complaint with the RFC.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="color: rgb(31, 73, 125);" class="">Our supplier is telling us this is normal behavior and that they went through the RFC and found this was normal behavior.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="color: rgb(31, 73, 125);" class="">If it’s not too much work, could you tell me in which part of the RFC this is described?<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div></div></div></blockquote>8.2.6.2 Headers and Tags<div class=""><br class=""></div><div class=""><br class=""></div><div class=""> The From field of the response MUST equal the From header field of</div><div class=""> the request. The Call-ID header field of the response MUST equal the</div><div class=""> Call-ID header field of the request. The CSeq header field of the</div><div class=""> response MUST equal the CSeq field of the request. The Via header</div><div class=""> field values in the response MUST equal the Via header field values</div><div class=""> in the request and MUST maintain the same ordering.</div><br class="Apple-interchange-newline"><br class=""><br class="">RFC 3261 basics. The UAS copies ALL Via:s from the request into the response. This is how we route responses through</div><div>a SIP network, so without all headers, communication will likely be very broken.<br class=""><br class="">/O<br class=""> <blockquote type="cite" class=""><div class=""><br style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""></div></blockquote></div><br class=""></body></html>