[AusNOG] Procurve POE Switch RTP issues

Andrew Yager andrew at rwts.com.au
Thu Apr 16 20:53:26 EST 2015


Hi Cameron,

There can be a few causes I've seen of this, particularly with SNOM
handsets.

Depending on if you are using LLDP/Voice VLAN in some SNOM firmware
versions (certainly prevalent in the version 7 and 8) I had a number of
issues where the LLDP initiated VLAN wasn't properly assigned to the phone
*randomly*, and we had to modify the configuration to statically set the
VLAN. This was resolved by changing firmware versions on the SNOM handsets.
It's also worth noting that there is a limit on the range of VLANs you can
use - high VLAN IDs also result in this problem in some firmware versions.

I typically see this problem with SIP ALG on routers crashing. I use
Asterisk as a SIP UA a lot, and we generally disable the ALG in the router,
ensure persistent NAT is enabled for the PBX destination IP and tell
Asterisk to be aware of NAT in the path to resolve this issue. (I can see
Jonathan has suggested this as well).

I have had a specific issue with SNOM 870 handsets and an issue similar to
the "SPEAKER" button vs handset audio - where we would get audio on answer
on the Speaker, but no audio on the handset in early 2014. The site had 20
SNOM handsets and Juniper switching, and the problem presented itself on 3.
SNOM also confirmed this as a known firmware bug and recommended rolling
back to an earlier version of the firmware (below their recommended release
at the time).

Happy to chat offline and work through some troubleshooting with you if you
would like; just flick me an e-mail (kids are just about in bed).

Thanks,
Andrew


On 16 April 2015 at 20:42, Karl Auer <kauer at biplane.com.au> wrote:

> On Thu, 2015-04-16 at 20:19 +1000, Joseph Goldman wrote:
> > Given he stated PoE switch I'd imagine the devices are PoE which on all
> > devices i've used means if they've powered on they are in the right
> > port, i.e. PoE IN is only on the correct port.
>
> The ethernet is in the correct port for the reasons you give, but also
> because the phones can initiate calls. The problem is that the call
> consists of silence in both directions, which might be explained by the
> handset at one end not being attached at all or being attached
> incorrectly.
>
> By handset the bit you hold in your hand when talking on the phone. The
> handset is usually connected to the station via a few feet of coiled
> cable plugged into an RJ11 socket. Since these are brand new phones I'm
> suggesting that a mistake may have been made when unboxing them, and the
> RJ11 plug might have been plugged into the ethernet passthru socket, or
> not properly inserted into the handset socket on the station. Or not
> properly inserted into the socket on the handset itself.
>
> It's a long shot, but stranger things have happened, and I have actually
> seen a phone with the handset incorrectly plugged into the passthru.
>
> Regards, K.
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Karl Auer (kauer at biplane.com.au)
> http://www.biplane.com.au/kauer
> http://twitter.com/kauer389
>
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-- 
*Andrew Yager, Managing Director* *(BCompSc, JNCIS-SP, MACS (Snr) CP)*
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