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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