[Asterisk-Users] How to use a data T-1?

[Steve Jones]

If you're going to have to open ports on your firewall for SIP anyway,
then why not put the server on the inside?  That being said, I don't
know if you'd need to punch holes for the phones being trusted and the
server on the outside..  

 

Personally I don't like the ideas of having a server outside, but maybe
I'm too paranoid?!

 

________________________________

From: Warren [mailto:warren-lists at icruise.com] 
Sent: Monday, June 19, 2006 1:23 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] How to use a data T-1?

 

So let's assume I am going to use G.729A.  I am looking at using Polycom
IP601 phones which support G729A directly, so the only licenses I
believe I would need are for the calls going to voicemail or in the menu
system at once - realistically that number never exceeds 5 simultaneous,
since the phones can handle the CODEC and no transcoding is needed, so
those do not need licenses according to
http://www.voip-info.org/wiki-Asterisk+G.729+Licensing.

It looks to me like, for testing, I can get a couple of the polycom
phones and have a server using an IP on the unused T1.

Assuming that is correct (which I will write up as an article for the
Wiki if anyone is interested when this is all done), the next thing I
need is a provider of VoIP service.  Also, it seems like the server
would go on the outside of my firewall with holes punched through for
the phones which would be on the ind=side of the firewall.  Would that
be correct?

W

Steve Langstaff wrote: 

Remember to add the RTP, UDP and IP overheads.

 

And then just do the math.

	-----Original Message-----
	From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com]On Behalf Of William
Piper
	Sent: 19 June 2006 17:12
	To: Asterisk Users Mailing List - Non-Commercial Discussion
	Subject: Re: [Asterisk-Users] How to use a data T-1?

	Depends on the codec. If you are using ulaw, you will only be
able to have about 23 calls. If you use g729 you can have as many as 187
simultanious calls on a data T1.

	 

	Remember, you have 1544Kbs of bandwidth. 

	g279=8Kbs per call

	uLaw=64Kbs per call

	 

	Just do the math.

	 

	bp
	
	 

	On 6/19/06, Warren <warren-lists at icruise.com> wrote: 

	Steve,
	
	I want to end up with a system that will let me send and receive
voice
	calls.  I guess what I want to do depends on the best way to do
that. 
	Can I do more than 23 (decent sounding) voice calls on a data
T-1 with
	someone else handling the final part of the call to the copper
for me?
	If so than that is my likely final destination.
	
	I have a channelized voice T-1 currently plugged into my
meridian 
	system, but I would like (if realistically possible) to do as
much of
	this over IP as possible for maximum flexibility.  Is that a
pipe dream
	or just silly given the current state of technology?
	
	I am lucky enough to work for a company that is letting me take
my time 
	with this, test the various options and come up with the proper
	solution.  I am assuming (I know: dumb to assume) at this point
that
	VoIP over a T-1 to a provider that can then route it to hard
phones for
	me would be the way to go.  Similarly, I would point my 800
number to a 
	DiD hosted by a VoIP provider that would then route the call
back to
	me.  If that is an incorrect assumption, please let me know.
	
	Regards,
	Warren

 



________________________________



 
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