<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">For starters I'd be leery of any 3rd party config guide that refers to CUCM 4.2. <div><br></div><div>I don't know that Cisco would support any particular feature with Microsoft Lync. Whether it will work or not is another question. Not knowing anything about the MS product I'd say media bypass is like CUBE flow-around. It means they aren't going to terminate RTP and instead pass through the SDP data from the other side.</div><div><br></div><div>Don't see any reason why this wouldn't work as long as they don't mess with the SDP in nasty ways.</div><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-align: auto; 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>-Ryan</div></span>
</div>
<br><div><div>On Jan 7, 2011, at 2:45 PM, Matt Slaga (US) wrote:</div><br class="Apple-interchange-newline"><span class="Apple-style-span" style="border-collapse: separate; font-family: 'Lucida Grande'; 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; font-size: medium; "><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Does Cisco support media bypass with Microsoft Lync? Microsoft is a bit cryptic with their explanation below. <o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 11.25pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; vertical-align: top; "><em><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: black; ">Media bypass</span></em><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: black; "><span class="Apple-converted-space"> </span>has been added to Lync Server. Media bypass allows media traffic to bypass the Mediation Server and flow directly from the client (that is, Lync Server) to the gateway or IP-PBX. When media bypass is configured, the signaling traffic continues to flow through the Mediation Server on its path to the gateway; however, media traffic bypasses the Mediation Server and is sent directly to the gateway. Media bypass requires support from specific gateways. These gateways will be listed in the<span class="Apple-converted-space"> </span><a href="http://go.microsoft.com/fwlink/?linkid=133622" target="_blank" id="ctl00_MTCS_main_ctl53_ctl00_ctl14_ctl00_ctl00" style="color: blue; text-decoration: underline; ">Microsoft Unified Communications Open Interoperability Program</a>.<o:p></o:p></span></p><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 11.25pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; vertical-align: top; "><span style="font-size: 8pt; font-family: Verdana, sans-serif; color: black; ">With media bypass, the Mediation Server role can now be co-located on a front-end server, simplifying deployment and management of Lync Server. This reduction in physical servers helps lower the total cost of ownership. By removing the media workload from the Mediation Server, it can scale higher to support thousands of users.<o:p></o:p></span></p><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" width="100%" style="width: 1040px; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: white; border-collapse: collapse; border-top-style: none; border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; background-position: initial initial; background-repeat: initial initial; "><tbody><tr><td valign="top" style="border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-left-style: solid; border-top-color: rgb(51, 51, 51); border-right-color: rgb(51, 51, 51); border-bottom-color: rgb(51, 51, 51); border-left-color: rgb(51, 51, 51); border-top-width: 1pt; border-right-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; padding-top: 3.75pt; padding-right: 3.75pt; padding-bottom: 3.75pt; padding-left: 3.75pt; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 19px; "><span style="font-size: 9.5pt; line-height: 16px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">Cisco<o:p></o:p></span></div></td><td valign="top" style="border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-top-color: rgb(51, 51, 51); border-right-color: rgb(51, 51, 51); border-bottom-color: rgb(51, 51, 51); border-top-width: 1pt; border-right-width: 1pt; border-bottom-width: 1pt; border-left-style: none; border-left-width: initial; border-left-color: initial; padding-top: 3.75pt; padding-right: 3.75pt; padding-bottom: 3.75pt; padding-left: 3.75pt; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 19px; "><span style="font-size: 9.5pt; line-height: 16px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">Cisco Unified Communications Manager<o:p></o:p></span></div></td><td valign="top" style="border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-top-color: rgb(51, 51, 51); border-right-color: rgb(51, 51, 51); border-bottom-color: rgb(51, 51, 51); border-top-width: 1pt; border-right-width: 1pt; border-bottom-width: 1pt; border-left-style: none; border-left-width: initial; border-left-color: initial; padding-top: 3.75pt; padding-right: 3.75pt; padding-bottom: 3.75pt; padding-left: 3.75pt; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 19px; "><span style="font-size: 9.5pt; line-height: 16px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">Direct SIP<o:p></o:p></span></div></td><td valign="top" style="border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-top-color: rgb(51, 51, 51); border-right-color: rgb(51, 51, 51); border-bottom-color: rgb(51, 51, 51); border-top-width: 1pt; border-right-width: 1pt; border-bottom-width: 1pt; border-left-style: none; border-left-width: initial; border-left-color: initial; padding-top: 3.75pt; padding-right: 3.75pt; padding-bottom: 3.75pt; padding-left: 3.75pt; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 19px; "><span style="font-size: 9.5pt; line-height: 16px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">UCM 4.2 2000-4-4a<o:p></o:p></span></div></td></tr><tr><td valign="top" style="border-right-style: solid; border-bottom-style: solid; border-left-style: solid; border-right-color: rgb(51, 51, 51); border-bottom-color: rgb(51, 51, 51); border-left-color: rgb(51, 51, 51); border-right-width: 1pt; border-bottom-width: 1pt; border-left-width: 1pt; border-top-style: none; border-top-width: initial; border-top-color: initial; padding-top: 3.75pt; padding-right: 3.75pt; padding-bottom: 3.75pt; padding-left: 3.75pt; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 19px; "><span style="font-size: 9.5pt; line-height: 16px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); "> <o:p></o:p></span></div></td><td colspan="3" valign="top" style="border-top-style: none; border-top-width: initial; border-top-color: initial; border-left-style: none; border-left-width: initial; border-left-color: initial; border-bottom-style: solid; border-bottom-color: rgb(51, 51, 51); border-bottom-width: 1pt; border-right-style: solid; border-right-color: rgb(51, 51, 51); border-right-width: 1pt; padding-top: 3.75pt; padding-right: 3.75pt; padding-bottom: 3.75pt; padding-left: 3.75pt; "><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 9pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 19px; "><span style="font-size: 9.5pt; line-height: 16px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">Configuration Notes:<o:p></o:p></span></p><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0.25in; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -0.25in; line-height: 22px; "><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); "><span>1.<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">On the Cisco IP-PBX, configure MTP to enabled and PRACK to disabled (the default for PRACK). The PRACK message sent by CUCM 4 is malformed by missing the MAXFORWARDS header.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0.25in; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -0.25in; line-height: 22px; "><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); "><span>2.<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">On Lync Mediation Server, Media Bypass is set to enabled. RTCP and REFER are set to disabled, as Cisco doesn't send RTCP messages and REFER is not supported by this IP-PBX.<o:p></o:p></span></div><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 9pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; line-height: 19px; "><span style="font-size: 9.5pt; line-height: 16px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">Known Limitations:<o:p></o:p></span></p><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0.25in; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -0.25in; line-height: 22px; "><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); "><span>1.<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">When a Lync user transfers a PBX call to another PBX user, the local PBX phone will still show connected to the first Lync user.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0.25in; font-size: 11pt; font-family: Calibri, sans-serif; text-indent: -0.25in; line-height: 22px; "><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); "><span>2.<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span></span><span style="font-size: 9.5pt; line-height: 19px; font-family: 'Segoe UI', sans-serif; color: rgb(51, 51, 51); ">Comfort noise generation is not supported. As a result, comfort noise is not played on Microsoft Lync.<o:p></o:p></span></div></td></tr></tbody></table><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Thanks!<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Matt Slaga<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">Dimension Data Americas<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><a href="mailto:Matt.slaga@us.didata.com" style="color: blue; text-decoration: underline; ">Matt.slaga@us.didata.com</a><o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; ">+1-571-203-4132<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; text-align: center; "><span style="font-size: 13.5pt; font-family: Webdings; color: rgb(79, 173, 38); ">ü</span><span style="color: rgb(79, 173, 38); "><span class="Apple-converted-space"> </span></span><span style="font-size: 9pt; color: rgb(79, 173, 38); ">Please contact Al Gore at 1-615-327-2227 to request permission to print this email.</span><span style="color: rgb(79, 173, 38); "></span><i><span style="color: blue; "><o:p></o:p></span></i></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 9pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><br class="webkit-block-placeholder"></div><hr size="1"><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 9pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><br class="webkit-block-placeholder"></div><p style="margin-top: 0in; margin-right: 0in; margin-bottom: 9pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><strong>Disclaimer: This e-mail communication and any attachments may contain confidential and privileged information and is for use by the designated addressee(s) named above only. 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