Hi Dennis/James, <br>Thanks for the quick reply.<br><br>The product that the customer have actually works for port mirror scenarios. I'm aware that those products are actually looking for SCCP messages during their capture. However, I'm wondering is the SCCP messages from the phone port (will see both tx/rx packets to the phone) sufficient ? Or do I need to span extra signalling messages from CUCM and as well as those extra rtp stream from voice gateway? <br>
<br>Currently, my best practise is i will span all the rx traffic into the voice vlan (ingress traffic into switchport) and rspan it to the recorder. However, now i'm hoping that I can simply sniff both tx/rx packets on the few IP phones that requires recording. <br>
<br>*imaging the site have 2000 phones and i only need to record 5 ip phones conversation in the network, the software vendor is worried about the cpu utilization as well if we were to enable span traffic everywhere*<br><br>
 <br><br><div class="gmail_quote">On Tue, Dec 27, 2011 at 2:21 PM, Dennis Heim <span dir="ltr"><<a href="mailto:Dennis.Heim@cdw.com">Dennis.Heim@cdw.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">






<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Many of the products offer either one of the following or a combination of the above: (1)Port Mirroring (2) Built-In Bridge (BiB) (3) Software on PC. You also
 need to determine if you need to record all calls, external only, internal only, etc.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d">Dennis Heim<br>
Senior Engineer (Unified Communications)<br>
CDW  Advanced Technology Services<br>
10610 9^th Place<br>
Bellevue, WA 98004<br>
<br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><a href="tel:425.310.5299" value="+14253105299" target="_blank">425.310.5299</a> Single Number Reach (WA)</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><u></u><u></u></span></p>

<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><a href="tel:317.569.4255" value="+13175694255" target="_blank">317.569.4255</a> Single Number Reach (IN)</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><br>

<a href="tel:317.569.4201" value="+13175694201" target="_blank">317.569.4201</a> Fax</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">
<br>
<a href="mailto:dennis.heim@cdw.com" target="_blank"><span style="font-size:10.0pt">dennis.heim@cdw.com</span></a></span><u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:blue"><br>

</span></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.cdw.com/content/solutions/unified-communications/" target="_blank">cdw.com/content/solutions/unified-communications/</a><u></u><u></u></span></p>

</div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<div>
<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a> [mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>]
<b>On Behalf Of </b>Buchanan, James<br>
<b>Sent:</b> Tuesday, December 27, 2011 12:07 AM<br>
<b>To:</b> Ki Wi; Cisco VoIP List<br>
<b>Subject:</b> Re: [cisco-voip] How does voice recorder works? Do I need RSPAN or ERSPAN?<u></u><u></u></span></p>
</div>
</div><div><div></div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Depends on the voice recording product you are using. The newer ones don’t require SPAN at all in many cases.<u></u><u></u></span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">James Buchanan</span></b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#7f7f7f">|</span><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"> UC
 Technology Manager </span></b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#7f7f7f">|</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">
<b>Presidio South </b></span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#7f7f7f">|</span><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"> Presidio Networked Solutions
</span></b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"><u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">12 Cadillac Dr Ste 130 Brentwood, TN 37027
</span></b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#7f7f7f">|</span><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">
</span></b><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="mailto:jbuchanan@presidio.com" target="_blank"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif"">jbuchanan@presidio.com</span></a></span></b><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#548dd4"><u></u><u></u></span></b></p>

<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">D: <a href="tel:615-866-5729" value="+16158665729" target="_blank">615-866-5729</a></span></b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"> </span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#7f7f7f">|</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">
<b>F:<a href="tel:615-866-5781" value="+16158665781" target="_blank">615-866-5781</a></b>  </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.presidio.com/" title="blocked::http://www.presidio.com/" target="_blank"><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif"">www.presidio.com</span></b></a><u></u><u></u></span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>
<a href="mailto:[mailto:cisco-voip-bounces@puck.nether.net]" target="_blank">[mailto:cisco-voip-bounces@puck.nether.net]</a>
<b>On Behalf Of </b>Ki Wi<br>
<b>Sent:</b> Monday, December 26, 2011 10:44 PM<br>
<b>To:</b> Cisco VoIP List<br>
<b>Subject:</b> [cisco-voip] How does voice recorder works? Do I need RSPAN or ERSPAN?<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I have a setup with 2 DC . There's couple of voice gateway and cucm in each DC.
<br>
<br>
There's a couple of distribution switches as well. <br>
<br>
Between 2 DC and distribution switches are all L3. <br>
<br>
Today, my requirement is only to span a few ports connected to the access switches of distribution switch "A". If I do a rspan from those IP phones back to distribution switch "A" and I will connect the voice recorder to distribution switch "A", will it work?
<br>
<br>
Is it neccessary for me to span the traffic from cucm and voice gateway as well? If so, ERSPAN is required.
<u></u><u></u></p>
</div></div></div>
</div>

</blockquote></div><br>