[Serusers] SER / MediaProxy / B2BUA

Ryan Pagquil rpagquil at philonline.com
Wed Jul 5 02:33:01 CEST 2006

Hi Daniel,
         Our setup is like what you have. We have SER /Mediaproxy, 
for the missing BYE's mediaproxy 1.7.2 do the job and to terminate 
calls we have a perl script that checks the radacct with  zero 
acctsessiontime and acctstoptime entries then compare it to the 
current credit of the username and if insufficient the script sends a 
BYE to both ends where the information came from radacct entry. The 
perl script uses sipsak to generate BYE message.


At 07:31 AM 7/5/2006, Daniel Salama wrote:
>Thank you for the prompt response and the explanation.
>Currently, I don't have any code in place. However, I was trying to
>simplify the whole architecture. I have a SER box talking to Radius
>for authentication and accounting. I'm also using Mediaproxy as a NAT
>helper. Then, I have Asterisk for IVR auto attendant and voicemail.
>Since Mediaproxy is going to be in the media path anyhow to help in
>NAT, I just don't want to have another Asterisk server in the media
>path just for the Dial command with the timeout.
>What would be an elegant alternative? I know that in the ISP dial-up
>world, Radius is more than capable of specifying max session time.
>Wouldn't SER/Mediaproxy "understand" the Radius attribute for max
>session time? I know SER doesn't stay in the media path but by being
>statefull, it can "listen" to all messages between the end points,
>including BYE. So, why couldn't SER/Mediaproxy "insert" a BYE message
>somewhere? Maybe it could be a simple as writing a simple external
>process that constantly monitors sessions time and "inserts" the BYE
>message using SER's fifo, in a similar way that serctl talks to SER.
>On Jul 4, 2006, at 5:03 PM, sip wrote:
>>All Asterisk B2BUA does, really (I'm referring to the script, not
>>the Asterisk
>>patch itself), is authenticate a call coming in, and then lookup in
>>what the session timeout for that call should be. It then creates
>>an Asterisk
>>dial string and sets the call timeout to be X number of seconds
>>based on the
>>session-timer attribute in radius.
>>If media proxy allows you to set session timers on the fly or has
>>some sort of
>>polling system (I don't know, I've never used it), allowing you to
>>terminate a
>>call after a certain period of time, then no, you wouldn't need
>>Asterisk B2BUA.
>>We actually ended up only partly using Asterisk B2BUA for our
>>stuff, because
>>it didn't quite do everything we wanted (it's really only a B2BUA
>>and it
>>relies rather heavily on some odd conventions in radius for
>>without a password (not really authentication)), so we coded our
>>own setup
>>which keeps track of session timeouts and call costs and the like
>>and then
>>uses the Asterisk B2BUA framework to create the Asterisk dial
>>string.  At this
>>point, there's no real reason we couldn't replace the whole thing
>>with our own
>>code (it became 95% ours in the process, but the process would have
>>NOwhere without the original code to set us in the right
>>direction). If you're
>>in a similar situation with mediaproxy, and it allows session
>>timers of some
>>sort, there's no real reason to NOT use your own setup.
>>On Tue, 4 Jul 2006 16:51:12 -0400, Daniel Salama wrote
>>>After reading this forum:
>>>it made me wonder, whether or not you really need B2BUA if you
>>>already have Mediaproxy in your environment. I know the purpose of
>>>Mediaproxy is to help with NAT situations. However, given the fact
>>>that Mediaproxy is always in the media path, couldn't it be ALSO
>>>used  to "terminate" a call in progress, the same way that B2BUA
>>>can? And  by B2BUA I refer to the Asterisk B2BUA, all within the
>>>context of  prepaid type services.
>>>Any comments?
>>>Serusers mailing list
>>>Serusers at lists.iptel.org
>Serusers mailing list
>Serusers at lists.iptel.org

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