I Just wanted to add something here,<br>Having separate VLAN does nothing in terms of QOS.<br>In fact having a computer feeding from phone make more sense because phone will untag packets coming from PC.<br>and after that its all about your switch how to prioritize packets.
<br>Unless there is a way in your switch to prioritize one Vlan over another Vlan, ( i guess it depends on your manufacture, i think Cisco does that and also uses CDP to discover phones) Having different Vlans is not your answer.
<br>the most you get is less broadcast.<br><br><div><span class="gmail_quote">On 10/19/07, <b class="gmail_sendername">David Gomillion</b> <<a href="mailto:david.gomillion@gmail.com">david.gomillion@gmail.com</a>> wrote:
</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><span class="q">On 10/19/07, <b class="gmail_sendername">Kevin Smith</b> <<a href="mailto:kevin.smith@mercury.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
kevin.smith@mercury.net</a>> wrote:</span><div><span class="q"><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>Robert McNaught wrote:<br>> Hi,<br>><br>> Has anyone had any great difficulties with QoS using the second<br>> ethernet phone in these Polycom phones for desktop machines in a<br>> converged network? I had heard that these can cause difficulties when
<br>> used in this manner. I have always tried to persuade customers to go<br>> with 2 ethernet drops per workstation to avoid having to use the phone<br>> as a switch.<br>><br>> I apologize for this question not being directly related to asterisk,
<br>> but since Polycom phones are used a lot with asterisk, it seems a good<br>> place to post ;-)<br>><br>> Robert McNaught</blockquote><div>><br>>Hi Robert,<br>><br>>While I'm not sure how our network compares with yours, we run about
<br>>twenty 601 phones along with our office workstations (some stations are<br>>without a phone). Each station with a phone is connected with the other<br>>Ethernet port on the phone so we have one drop to each station. The
<br>>phones are on a separate VLAN from the rest of the network as well.<br> >From the user end, I have not had a report of any problems with the<br>>connections, call quality, etc. I would say give it a shot, maybe with a
<br>>larger network that could change, but for a small office like I'm in<br>>charge of, it is working just fine.<br>><br>>Kevin </div><br></span>We have a medium-sized network (120 polycoms of various persuasions, and 80 workstations), and we haven't had any real problems with phones ruining QoS. We have the phones on separate VLANs than the workstations. Actually, every switch has 4 VLANs defined: 2 voice, 2 data, so no VLAN has more than about 12 devices (about because sometimes we have to put a pocket switch in a room where the people want to add yet another computer).
<br><br>The echo from SIP to SIP with people using cheap headsets has affected us far more than any problems with PCs trying to suck the bandwidth. If I remember correctly, recent firmwares on the Polycom phones pretty much do the right thing, giving priority to the phone traffic.
<br></div><br>To summarize: works OK for us.<br>
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