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LINUX-L  2007

LINUX-L 2007

Subject:

Re: peer-to-peer VOIP?

From:

Martin Smith <[log in to unmask]>

Reply-To:

Platform Independent Linux List! <[log in to unmask]>

Date:

Tue, 11 Sep 2007 16:47:05 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (52 lines)

Brian and list,

Many phones support "IP direct dialing" (Linksys Sipura devices, I
think, are one example). I would expect you would find this feature most
commonly in phones that speak SIP. 

SIP is an application-layer routing and negotiating protocol, and does
not participate in the RTP stream at all. Some PBX makers may get in the
middle of the stream, but that is a side effect of using SIP to route
the stream through the PBX, as I understand it.

*Most importantly, losing the central SIP routing doesn't typically
break a call in progress.* Obviously, if you lose TCP/IP routing, your
RTP packets aren't going anywhere either, but at least TCP/IP routing
doesn't have to be a single point of failure (neither does SIP actually,
so in a good deployment you aren't slave to a SPOF).

There are some other ways to map telephone "numbers" to IP addresses,
such as ENUM and DUNDi, of which DUNDi is peer-to-peer. You'll find
entries for both in Wikipedia.

I have no idea if the UF-recommended phones can do this, though a quick
search in Google suggests that they might be able to.

Martin Smith, Systems Developer
[log in to unmask]
Bureau of Economic and Business Research
University of Florida
(352) 392-0171 Ext. 221 

 

> -----Original Message-----
> From: Platform Independent Linux List! 
> [mailto:[log in to unmask]] On Behalf Of Brian Bartholomew
> Sent: Tuesday, September 11, 2007 4:21 PM
> To: [log in to unmask]
> Subject: peer-to-peer VOIP?
> 
> The question came up at lunch: 
> 
> If you have a building full of the UF-recommended brand of VOIP phones
> on the same LAN, can they talk to each other without involving any
> additional central points of failure?  I'm not asking for conference
> calls, voicemail, recordings with beeps, queues, forwarding, or
> whatever.  Just using the last quad of the IP as an extension number.
> 
> And if not, is there any alternative type of phone that can do this,
> and can also use the UF POTS gateway?  Or Skype?
> 
> 							Brian
> 

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