I don't like all this cross-posting, so I have removed the other lists. My comments will be from iptel.org perspective. Inline.
Fredrik Lundmark wrote:
Hmm,I find the dialog I initiated both amusing and (for me) very informative. Being pretty new to these lists, I'm evaluating technology to use for an ITSP setup and I'll welcome more comments and views as the ones below - they help me understand "what to use for which purpose".
What my needs are:
- Prepaid support - maybe I don't need a b2bua, could the dialogue module be "call-aware" and be used to terminate calls upon "end-of-credits"?
Either you need a b2bua where you also proxy the rtp stream or you need to accept that you get "hung" calls (i.e. BYEs never hitting your box) due to various reasons, for example UA power failure. OpenSER has dialog-statefulness like the one you are looking for. iptel.org users tend to lean towards: it's a telco-problem, fix it in the telco-world (using ex. Session-Timers or timing the PSTN calls in the gateways) or go the full line, use a b2bua. I believe there's a calling card app in sems that you can use/adapt.
- Filtering of Refer & Replace (RFCs 3515, 3891, 3892), replacing them with Re-Inivtes - to support most UAs, at the same being compliant with SIP trunks supporting SIPConnect
Now, for this you "need" a b2bua to be compliant in all scenarios. I know some people have successfully caught 302s from UAs, then instead of sending the reply back, append a branch with the ruri in the Diversion header. Doing more than that is generally considered "fixing broken UAs" and the general advice is "don't support it". You are quickly getting yourself into a situation where supporting 2% of your user base, takes 80% of your maintenance costs.
- IVR capability - i.e. "regular IVR" (customized stuff) as well as standard applications (voicemail, conference)
Here people split between asterisk, sems, and commercial. Sems can do some simple stuff right out of the box, but you will probably have to do some coding for what you need. Asterisk is more likely to give you more out of the box, but if you still need adaptation, you will find it more time-consuming adapting asterisk.
- Queuing of calls
Well, as in "please hold, we will pick up the call whenever we feel like it" ? This is a pbx or a call center application.
- 3pcc - capability for handling calls from a operator's application
Simple 3pcc can be done in SER, while many/most call flows require a b2bua. SEMS gives you quite a lot of power, but I have no experience in using sems in this area. You should probably look at what IETF BLISS working group is doing.
Anyone wanting to advise?
I hope it helps. g-)
BR///
Fredrik
----- Original Message ----- *From:* Greger V. Teigre mailto:greger@teigre.com *To:* SIP mailto:sip@arcdiv.com *Cc:* Fredrik Lundmark mailto:fredrik@dimi.se ; serusers@lists.iptel.org mailto:serusers@lists.iptel.org *Sent:* Friday, August 24, 2007 9:27 AM *Subject:* Re: [Serusers] why combine ser with asterisk
Hm, I don't agree with that comparison ;-) Asterisk is a PBX, SEMS is a platform for specific applications. There are some common pre-developed applications that easily can be set up (like a conference bridge, play announcements etc). However, if you need a PBX with lots of features, you don't start with SEMS.
I would rather compare Asterisk to a pick-up truck and SEMS to the Porsche. Use the truck for pretty much any work, but the Porsche is made for speed... :-)
Using Asterisk as only a conference bridge and playing announcements is like using the pick-up truck to move your 12-piece china... g-)
SIP wrote:
Offers them? Yes. Offers them in a clean, friendly, usable package? Not so much yet.
SEMS has raw capability, but if you want it to do many of the things Asterisk can do, you need to know how to code that yourself, or you're going to be digging about the code for documentation on features (since the current docs are not the world's greatest).
Don't get me wrong, SEMS has its place, and is a constantly evolving work of art (we use SEMS for several things in our environment), but comparing SEMS to Asterisk is a bit like comparing a bunch of car parts to a Porsche.
N.
Fredrik Lundmark wrote:
I'm still learning myself, but SEMS (iptel.org/sems) seems to offer many of the media- and/or b2bua-functions that Asterisk do.
///Fredrik
----- Original Message ----- From: "SIP" sip@arcdiv.com To: "Nhadie" nhadie@tbgi.net.ph Cc: asterisk-users@lists.digium.com; serusers@lists.iptel.org Sent: Thursday, August 23, 2007 1:38 PM Subject: Re: [Serusers] why combine ser with asterisk
Asterisk is an excellent PBX system, and makes a very good endpoint in the SIP chain for all sorts of things -- IVR systems, voicemail applications, automated messages, etc.
It has an extremely well-written CDR engine, so many people mesh it with billing applications to produce accurate accounting information. It also is fully aware of the media stream, which means it's capable of cutting off a call mid-stream, injecting audio into the call, etc, etc.
Programming for Asterisk addons can be easily done in just about any language, and it meshes well with the overall structure. Programming for SER is... not so simple.
As for running them both on the same box, the biggest problem would be resources. Unlike SER, Asterisk is not designed to be a carrier-grade SIP proxy. If you're actually proxying the media stream, you'd be hard-pressed to squeeze more than 150 simultaneous calls out of Asterisk on even the beefiest of hardware. Add SER to the same box, and you will quickly run into resource problems in medium-sized environments. It also doesn't have a lot of the SIP proxy functionality that SER has.
If you're careful, you can configure Asterisk NOT to handle the media stream and still use it for prepaid solutions (using astcc or asterisk-b2bua), and this will save you bandwidth (but you'll still likely run into NAT issues that need to be dealt with somehow) and still let you use Asterisk as an in-between point.
Together, Asterisk and SER make a very powerful combination for providing a full suite of services to clientele, and each plays well off the other's strengths.
N.
Nhadie wrote:
Hi All,
What's the advantage of combining ser with asterisk? I always see comments like using ser with asterisk is a very good solution etc. etc. the thing i liked with ser is that it does not do codec translation, which saves me cpu usage and also bandwidth. if i combine it with asterisk, would it not use codec translation?
i also read that there is also a problem when ser and asterisk is run on the same machine, why is it so? if use prepaid billing solution for asterisk like astcc, would i then be able to provide prepaid service?
soryy for asking too much, i'd just like to really understand it. Thank You in advanced.
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