Re: [asterisk-biz] How Realistic is Hosted VoIP for SMBs?

Fri, 03 Nov 2006 11:43:33 -0800

I appreciate the thoughts posted on the this thread. If I may, I would like to rephrase the question about hosted VoIP for SMBs:

Can Asterisk allow direct media (audio) between two end points that are behind a NAT (typical SMB scenario) that is different than the the NAT where Asterisk server is located (hosted VoIP)?

According to Olle E. Johansson, Asterisk guru,
(http://lists.digium.com/pipermail/asterisk-doc/2004-June/000547.html)

Canreinvite=yes *only* works if all devices are on the same side of the NAT, the

outside or the inside.

If one device is on a different side of a NAT device than another phone
or Asterisk, you can't allow re-invites for that device.

He attributes this limitation to Asterisk not being a true SIP Proxy. That being the case, would one have to put SER or Session Border Controller (SBC) in front of Asterisk to achieve peer-to-peer media stream directly between the endpoints thus avoiding the WAN? Or, would one have to use SipX which IS a true SIP proxy as well.

Thanks.



On 11/3/06, Mike Hammett <[EMAIL PROTECTED]> wrote:









How redundant is it?  I'm still waiting to 
hear from them directly, but is it completely 1 + 1 redundant?  It might 
protect against Asterisk failures, but does it then become a single point of 
failure?


 


 


----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com


 


 



  
----- Original Message ----- 

  

From: 
  Brett 


  
  
Sent: Friday, November 03, 2006 11:21 
  AM

  
Subject: Re: [asterisk-biz] How Realistic 
  is Hosted VoIP for SMBs?

  

You guys need to look into the Ranch Networks solution.  
  With a Hosted PBX, you can put the Asterisk box at you location.  Then we 
  take a Ranch Networks box and put it at the customers site.  the Ranch 
  Networks box does all the NAT traversal, qos, firewall, etc. plus it will 
  bring the media locally so you don't have to go over the internet for simple 
  branch to branch calls.  Plus, the ranch Networks box provides high 
  availability or clustering if you need that. 

There ya go, one box 
  fixes all.




  
On 10/30/06, Ron 
  Wellsted <[EMAIL PROTECTED]> wrote: 
  
-----BEGIN 
    PGP SIGNED MESSAGE-----
Hash: SHA1

shadowym wrote:
> If you 
    don't have full control of the network from end to end (or have 
> 
    someone do that for you), it will never be a reliable solution in my 
    humble
> opinion.  People are getting away with it in some 
    cases but the bottom line
> is they cannot guarantee quality of 
    service. 
>

I must agree with this having seen a 5 phone office 
    with a hosted system
over ADSL.  The system was never reliable 
    and they eventually scrapped
it and came to us.  As we are in 
    the same building, I setup their phones 
on to asterisk with their own 
    contexts, etc. and replaced their simple
switch with a Linksys 224P (poe 
    + layer3 managed).  Inbound calls are
presented on a ISDN BRI 
    (ZapHFC), outbound via VoIP.  The only comment 
has been about 
    the occasional slight echo.

- --
Ron Wellsted
[EMAIL PROTECTED] 
http://www.wellsted.org.uk
N 
    52.567623 , W 2.137621 Linux Counter No. 202120
FWD:519961
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