[AusNOG] Procurve POE Switch RTP issues

[Mark Dignam]

To add to this one - I have seen a VOIP phone (damned if I can remember the
brand) where the RJ11 coily cable between the base and the handset wasn't a
straight through.. 

In essence, you had to use their cable, you couldn't replace it with a
longer one until you matched the pinout, which is how I found the issue... 

Back to original topic - its gotta be a NAT and/or an ALG "try to be
helpful" issue.  Like another member mentioned, I try to disable all SIP
ALG's, and just let the phone and gateway sort 'em selves out.

Dig.

-----Original Message-----
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Karl Auer
Sent: Thursday, 16 April 2015 6:42 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Procurve POE Switch RTP issues

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.