For completeness (as it has been mentioned in this thread):
SEMS SBC's pendant to dialog module API is the "SBC call control" API;
if you want to use a B2BUA (e.g. to enforce SST), briefly documented here:
http://git.sip-router.org/cgi-bin/gitweb.cgi?p=sems;a=blob;f=doc/Readme.sbc_call_control.txt
Stefan
o Daniel-Constantin Mierla on 01/06/2012 11:17 AM:
Just to add here the option of using kamailio's dialog module to
implement prepaid systems. It will be at signaling level (so no
ivr/media capabilities), which can fit very well in many scenarios.
If it is the case of 1 call per user at a time, then practically can
be done from kamailio config only. When call starts, compute the max
duration for that call based on caller/destination (e.g., call a
stored procedure via sqlops) and set the dialog timeout to that
duration. When call ends (BYE in main route or timeout route) update
the credit accordingly.
For many simultaneous calls, you can write a small module that uses
the dialog API, to update the timeout of ongoing calls based on the
costs for new calls.
Also, dialog module can be used as a controller of the signaling,
being handled by an external billing engine. When a call starts,
inform the billing engine about it. When there is no more credit, the
billing engine can send MI/RPC command (e.g., via xmlrpc) to end the call.
Cheers,
Daniel
On 1/5/12 3:02 PM, Stoyan Mihaylov wrote:
Prepaid is very simple task. User must put some money in his
account. User selects target. You calculate how long could be the
call, and you dial target.
At the end of call - you calculate call, and you take money from user.
Complications - recharging account. There are lot of problems there,
mainly with security.
If you would like to allow your users to make more then 1
simultaneous call.
There are couple of things, you should decide:
1. If you plane to offer some specific solution - then you should
select opensource project, or you even should start from scratch.
2. You can look for problems with different solutions on market.
"How I can choose the right solution" - mission impossible - in all
cases you will see later that there is may be some better solutions.
Best you can do is to select more or less good solution which will
do job you need.
Commercial products, in theory have better support. But they rely on
provider.
As you see with Kamailio - free products can rely on provider and
community, and you can get paid support, you also can easily (more
or less) switch supporter.
There are hosting solutions also, but I have no experience with them
at all.
My main experience is with freelance support for Asterisk through
ssh, and this is why I cant help with freeswitch. Best advantage of
Asterisk (except I know it better) is it allows any language for AGI
scripts, and with them you can do everything.
On Thu, Jan 5, 2012 at 3:42 PM, Carlo Dimaggio
<jaasmail...@gmail.com <mailto:jaasmail...@gmail.com>> wrote:
Hi Stoyan,
I prefer Freeswitch, but I know that Asterisk can do prepaid and
there are different prepaid solutions.
Anyway, as the prepaid server is a mission-critical component, I
would like to have your (and the community) opinion about the
preferred architecture and experiences about
opensource/commercial solution (advantages and drawbacks).
All the billing solution are good enough for a service provider
environment? How I can choose the right solution if all vendors
say that their solution is the best one? :)
Regards,
Il 05/01/12 13.18, Stoyan Mihaylov ha scritto:
I can suggest using Asterisk for prepaid job.
I mean you can use Kamailio and couple of Asterisk servers
behind it to do prepaid. There are lot of prepaid solutions for
Asterisk. But again, if I have to do it I will prefer my
solution, or using parts from what is available.
PS
We did prepaid things for Asterisk.
On Thu, Jan 5, 2012 at 1:08 PM, Carlo Dimaggio
<jaasmail...@gmail.com <mailto:jaasmail...@gmail.com>> wrote:
Hi all,
I'm working in a project for a service provider in which
prepaid is an essential requirement. They have about 12000
subscribers.
The core infrastructure will be Kamailio+RTPProxy while I
have some doubts about the prepaid feature. I'm thinking
about a B2BUA (SEMS or Freeswitch) that is called if the
user belong to a "prepaid group" and perform authorization
and accounting; in this case the SIP flow could be:
Kamailio -> B2BUA(Prepaid) -> Kamailio. Is a good choice?
At the moment I cannot estimate the effort needed to
develop this section (base prepaid feature) of the
project... Do you have some hints?
What are the prepaid solution implemented by you? Do you
use your own developed solution or do you think that is
better to choose a commercial solution (that provide also
calling-card and other features)?
I have seen some commercial products (Portabilling,
Jerasoft/Bilberry, ...); what do you think about?
Best Regards,
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--
Daniel-Constantin Mierla --http://www.asipto.com
http://linkedin.com/in/miconda -- http://twitter.com/miconda
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