David,
I've used a few of the Gigaset A580's in a small environment where paging
wasn't really an issue. Seemed fine and seemed to be well constructed.
The one thing that I can confirm is the Aastra DECT handsets that came with the
57iCT and 480iCT's are best used to hold doors open. They come with a 12 month
warranty but routinely stop working around 13 months. The batteries are very
difficult to obtain also. It's a product that should just go away.
Darrick
From: Ron Byer Lists [mailto:ronb-li...@netweave.com]
Sent: Monday, August 13, 2012 4:19 PM
To: AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Wireless DECT / VoIP SIP phones?
David,
I've used both the snom m9 and the Panasonic TGP500 a bit. I've also deployed
the Aastra DECT handsets that accompany the [9]480i CT.
the m9 is a small/light handset, not quite cheap feeling, but much
lighter/smaller than the Panasonic (or the Aastra handsets, for that matter).
the m9 uses a completely different technology base that the snom deskphones, so
don't expect any common-ality between them.
I can't speak completely for the intercom capabilities, but I seem to recall
that you can intercom between the handsets, but not generically through
Asterisk. Also, you cannot dynamically change the ring tone using the SIP
Headers approach. They have expressed a desire to do so, but that was two years
ago on the m3.
I have had some troubles in some situations with getting the snom m9 to work
reliably with certain routers. It's a mystery why it works in some cases and
not others, but the phone has a bit of a tendency to lose registration and just
sit there. A reboot always helps. I have deployed the Panasonic in some cases
where the m9 doesn't play well.
That being said, the Panasonic uses a *completely* different registration
methodology than your typical SIP Phone. A typical SIP phone will be configured
to resend a registration ever so often, and, if so configured, asterisk will
send down options packets every so often. This keeps the port path through the
router open and fresh.
The Panasonic TGP family sends ONE registration at the dawn of time, and sends
42 byte SIP heartbeats every 30-90 seconds, for which there are no responses
either defined or expected. Many times if these packets don't reach the
asterisk pbx, the phone is blissfully unaware and will still say it is
registered. It's ironic that I started using the Panasonic as a stop-gap for
the m9... I currently have a semi-large installation where the customer
acquired a bunch of TGP550's (handset + deskset), and after some period of
time: could be days, weeks, months, the phone just decides to stop sending the
heartbeat, and, 90 seconds later the router closes the path, and the phone has
to be rebooted. I do have the attention of a 2nd/3rd level support tech within
Panasonic looking at pcap files regarding this, but my confidence level is not
high at present that it will be resolved in my lifetime.
Some users like the m9 handset because it is light and small. Others like the
meatier Panasonic or Aastra. Personal preference.
Hope this helps,
Ron
On 8/13/2012 4:36 PM, David Kerr wrote:
Does anyone have any experience with wireless DECT phones for VoIP / Asterisk.
A google search has turned up Snom M9r, Siemens Gigaset A580 IP, Panasonic
KX-TGP500. The Gigaset is significantly cheaper than the other two but I can't
find a good review/comparison of them all. One feature that I would want to
use in the future, though maybe not initially, is intercom/paging... which
means support for additional SIP header with answer-after=0 appended. It is
not clear whether any of them will work with this, the only documentation I can
find suggests that the Snom might work... but only if it is told that the IP
PBX is the Snom ONE.
Thoughts, or other alternatives.
David
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