[asterisk-users] polycom ip330/ip501 second ethernet port

[Al lists]

I Just wanted to add something here,
Having separate VLAN does nothing in terms of QOS.
In fact having a computer feeding from phone make more sense because phone
will untag packets coming from PC.
and after that its all about your switch how to prioritize packets.
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.
the most you get is less broadcast.

On 10/19/07, David Gomillion <david.gomillion at gmail.com> wrote:
>
> On 10/19/07, Kevin Smith <kevin.smith at mercury.net> wrote:
> >
> >
> > Robert McNaught wrote:
> > > Hi,
> > >
> > > Has anyone had any great difficulties with QoS using the second
> > > ethernet phone in these Polycom phones for desktop machines in a
> > > converged network?  I had heard that these can cause difficulties when
> >
> > > used in this manner.  I have always tried to persuade customers to go
> > > with 2 ethernet drops per workstation to avoid having to use the phone
> > > as a switch.
> > >
> > > I apologize for this question not being directly related to asterisk,
> > > but since Polycom phones are used a lot with asterisk, it seems a good
> > > place to post ;-)
> > >
> > > Robert McNaught
>
> >
> >Hi Robert,
> >
> >While I'm not sure how our network compares with yours, we run about
> >twenty 601 phones along with our office workstations (some stations are
> >without a phone). Each station with a phone is connected with the other
> >Ethernet port on the phone so we have one drop to each station. The
> >phones are on a separate VLAN from the rest of the network as well.
> >From the user end, I have not had a report of any problems with the
> >connections, call quality, etc. I would say give it a shot, maybe with a
> >larger network that could change, but for a small office like I'm in
> >charge of, it is working just fine.
> >
> >Kevin
>
> 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).
>
> 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.
>
> To summarize: works OK for us.
>
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