[Asterisk-Users] NAT, SIP (was: No sound with SIP Phones on the Internet)

[Uriel Carrasquilla]

Chris:
What I think makes the SER solution attractive is the fact that Asterisk
tends to drop registration of SIP phones.  I agree, SER works like a
Gatekeeper and for that matter IAX when the two end-points can be bridged.
Regards,
Uriel

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Chris
Albertson
Sent: Tuesday, October 14, 2003 2:36 AM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] NAT, SIP (was: No sound with SIP Phones on
the Internet)



--- Uriel Carrasquilla <uriel at adelphia.net> wrote:
> John:
> are you aware of any documentation on how to configre SER to be a
> front-end
> to Asterisk?
> I suspect it is very inexpensive to put a SER server in a hosting
> facility

I think the cost is about the same as for putting a web server
at a hosting facility.  But I don't think you need high bandwidth.
SER simply sets up the call. I don't think the audio data actually
goes through SER.  It goes directly between the two end points.

This is the big problem with using Asterisk for SIP.  With Asterisk
the audio data between two SIP extensions has to actualy go into
then out of the Asterisk box.  This does not scale well to
thousands of users like in a university campus or a comercial
SIP service.


> to forward traffic to multiple Asterisks based on Least Cost Routing.
> My problem is that my experience is with Asterisk and not with SER.
> Uriel
>
> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com
> [mailto:asterisk-users-admin at lists.digium.com]On Behalf Of John Todd
> Sent: Monday, October 13, 2003 8:11 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] NAT, SIP (was: No sound with SIP Phones
> on
> the Internet)
>
>
> >I'm curently looking into using SER to front end SIP calls for
> >Asterisk.
> >Basicaly all SIP users would register with SER not Asterisk and then
> >Asterisk and SER exchange registrations.
> >
> >SER is a very capable SIP router, much more sophisticated than
> Asterisk
> >as it can look inside packets and route based on what it finds or
> even
> >re-write packets based on user specified logic.
> >
> >SER is GPL'd and has very good user documentation.  Don't know how
> well
> >the above will work.  The claim by the authors or SER that it can
> >handle thousands of calls per second is quite impressive
> >
> >One other nice feature is that SER users can set up their own SIP
> >accounts using a web interface and not needing  to edit *.conf
> files.
> >
> >See here for details http://www.iptel.org/ser/
> >
> >
> >=====
> >Chris Albertson
> >   Home:   310-376-1029  chrisalbertson90278 at yahoo.com
> >   Cell:   310-990-7550
> >   Office: 310-336-5189  Christopher.J.Albertson at aero.org
> >   KG6OMK
>
> SER is an excellent option as a front end to Asterisk.  It is a
> "true" SIP proxy, whereas Asterisk is a hybrid, and SIP has not been
> the primary focus of Asterisk development.  In fact, Asterisk's SIP
> implementation is very limited (though it is extremely pragmatic.)
>
> However, moving to SER does not solve any of the issues about the
> proxy being behind a NAT, and I believe that SER will have the same
> problems (though I could be wrong on this; I haven't experimented
> with SER's ability to work from behind a NAT.)   SIP clients work
> well enough behind NAT (most of them, anyway) but the servers are a
> different story.
>
> I really like SER's third-party addons for account administration;
> Asterisk is significantly more complex, and probably would not be as
> easily converted to such a front end.  In fact, SER has a very
> complex routing/scripting language that is not easily administered
> with a web front end, so I think that SER and Asterisk suffer from
> the same problems.  If someone were to come up with a simple way to
> administer voicemail.conf and sip.conf from a web tool, that would go
> far to making Asterisk a bit more user-accessible...
>
> JT
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>
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=====
Chris Albertson
  Home:   310-376-1029  chrisalbertson90278 at yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson at aero.org
  KG6OMK

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