[OpenSIPS-Users] Is opensips a front end to asterisk?

Jeff Pyle jpyle at fidelityvoice.com
Thu Jul 9 23:29:23 CEST 2009

I¹ll second that.  I¹m fairly new to Opensips, but not to SIP and definitely
not to Asterisk.  As I started to realize the limitations of Asterisk I
looked for something a bit more powerful and flexible.  I started reading
some of the module documentation to get an idea what Opensips (Openser at
the time) was capable of.  It referenced a lot of things I didn¹t
understand.  So, I ended up at RFC3261.  It was invaluable to me to
understand exactly what a proxy, uas, uac, and a few other key terms meant.
And what their specific functions were in a SIP environment.  I¹m far from
an expert but I¹ve learned a lot.  It has really helped me understand what a
proxy¹s role is, and also what a proxy¹s role isn¹t.  Opensips is a proxy,
after all.

- Jeff

On 7/9/09 1:53 PM, "Brett Nemeroff" <brett at nemeroff.com> wrote:

> I know this may sound like a pretty lame answer, but you'll get a lot of
> benefit from reading the definition of a SIP PROXY from RFC3261. 
> You can't do much with OpenSIPS (properly) if you dont' know the underlying
> RFC. This is very different from other SIP software packages, like Asterisk
> where you pretty much can't break RFC compliance on purpose (hah, it may just
> already be broken)..
> -Brett
> 2009/7/9 Raúl Alexis Betancor Santana <rabs at dimension-virtual.com>
>> ---------- Forwarded message ----------
>> From: "Raúl Alexis Betancor Santana" <rabs at dimension-virtual.com>
>> To: lists at grounded.net
>> Date: Tue, 7 Jul 2009 20:47:01 +0100
>> Subject: Re: [OpenSIPS-Users] Is opensips a front end to asterisk?
>> On Tuesday 07 July 2009 20:15:01 lists at grounded.net wrote:
>>> > On Tue, 7 Jul 2009 14:02:11 -0400, Alex Balashov wrote:
>>>> > > Specific and well-parameterised questions really are the key.
>>> >
>>> > I'll certainly do that, once I start understanding the product but for
>>> now,
>>> > I'm just trying to get a handle on basics, not deep in depth
>>> > understandings, just enough to formulate a plan.
>> You should go into deep knowleadge, it's a MUST to work with a sip proxy. You
>> could begin reading the "Getting starting gide" and so.
>>> > One was asking about the viability of using opensips on ESXi. Because of
>>> > how easy it is to use snapshots, backup and so on, this would be the best
>>> > working environment. So my question was, does opensips have any hardware
>>> > timing requirement issues such as asterisk does. If timing is not
>>> critical,
>>> > as a voip server is, then opensips must run nicely in a virtual manner.
>> Yes, you could use it into a VM, no timming issues like Asterisk. Talking
>> about backup and so ... you only need to do a backup of the .cfg file and the
>> database backend you use, so you will not get any real advantage of running
>> inside a VM from backup point of view.
>>> > I don't have any numbers to work with, which is why I say scalable. I'm
>>> > looking for something which can help me to scale a voip based application
>>> > to many users. So let's say hundreds of users so that we have a number. I
>>> > know many of you are running many thousands so this should be a good
>>> > starting point.
>> It depends on lot of variables, like available mem, CPU power, network (the
>> most important part), but also how complex is your .cfg about request
>> proccessing, how do you handle database request, etc.
>> So there is not a magic formula, but there are sip-proxies around the world
>> working with Million of users.
>>> > This is how I would have approached this, until I started looking for a
>>> sip
>>> > gateway/load balancer.
>> That's a setup, not direcly related with the software you use.
>>> > This should be pretty straight forward to those who have pro setups and
>>> > want as much reliability as possible. I want to have two separate
>>> locations
>>> > so that I can fail over, simple as that really.
>> There are not "simple" scenarios in SIP world and faiolver is very-complex
>> one.
>>>> > >-From what I can tell, opensips could act as a pbx on it's own but it
>>>> can
>>>> > > act as a proxy/load >balancer/gateway to asterisk systems as well.
>>> >
>>> > This is what I asked about in this thread a couple of times now. It's not
>>> > fully clear to me, even after reading. It sometimes sounds like opensips
>>> > can be a voip server though it does not provide other media services such
>>> > as voice mail and so on. I get that it is a gateway but I'm trying to get
>>> > better understanding of FROM that point on.
>> That's because Opensips it's a proxy, not a PBX, not a B2BUA, etc., it
>> doesn't
>> manage media, so you need some "complements" to have a "full-featured VoIP
>> system"
>> --
>> Raúl Alexis Betancor Santana
>> Dimensión Virtual
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