On 28 Sep 2006, at 19:18, Mark Farver wrote:
Here's my setup, I'd like to hear what everyone suggests is the
best route:
I have three sites, a main and two outlying buildign, each has a
Mitel SX200 system with a PRI interface. The outlying sites
currently each have a PTP T1 line back to the main site.
Right now I have a P2 700mhz Asterisk server at each site with a
Digium 4 port T1 card. Each Asterisk server sites between its
site's external T1 line and Mitel switch. Each Asterisk box is
also connected to the PtP T1 line. I am using ZaptelPPP to send
data on 12 channels, and the rest are left free for voice calls.
The Asterisk boxes do some limited LCR, and route outbound calls
over the PtP T1 to whichever site has the most affordable outbound
calling plan for the call in question, as well as sending site to
site calls over the PtP.
It works, but using ZaptelPPP is a bit of a pain, and it makes
upgrading a hassle, since I haven't found ppp packages for a recent
OS so now I have to have the compiler on each box, etc. Making
changes to the asterisk servers means taking down the data
connections as well, which is unpopular with the users. One site
has never worked, despite having identical configuration to the
other site. The data bandwidth is always limited to 12 channels,
even when the voice channels are idle.
So what route would everyone recommend? I can move the PtP
connections to independent WAN routers with QOS, then the Asterisk
boxes will need to do TDM to SIP and back. Right now everything is
TDM switching. Will the slow P2s have the horsepower to handle 12
or 13 TDM to SIP calls?
Or should I stick to my current system and just deal with the
upgrade hassle? (I wouldn't even upgrade, except that Caller ID
Name information doesn't work on my current 1.0 version)
Key question: do you need to do fax (or analog modem) between the
sites ?
If you don't then your best bet will probably be to take PtP
connections over to pure IP, set up some sort
of bandwidth sharing or Qos to keep the split roughly the way you
have it now. Then run IAX trunking between
the Asterisk boxes. Provided you aren't transcoding the load on those
boxes won't be much different.
You will however lose about half a channel's worth of capacity due to
the packet overheads of running
IAX, but that's much less than you would lose with SIP.
If you do need Faxing, then you need to stay with TDM on the T1s, but
perhaps replace the ZaptelPPP with
a box that splits the T1 into 2 separate T1's each with fewer
channels (can't think of the name for it ...) or
a Cisco that does the same thing.
Mark
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Tim Panton
www.mexuar.com
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