[Freeswitch-users] mod_opal - call charged before H.225 connect

Claudiu Filip claudiu at globtel.ro
Wed Oct 7 05:40:57 PDT 2009 



Hi Tihomir,


   I've  done  some  tests  to  see  how  suitable  is freeswitch as a
   SIP/H323  translator  and  you  are  right about the fact that H323
   'alert+open  logical  channel'  will generate a SIP '200 OK'. I was
   able  to fix that with a couple of changes in mod_opal.cpp, however
   some  things  were changed on mod_sofia in the latest svn. (on this
   particular  issue,  open_logical_channel  is  processed  BEFORE the
   alerting,   so   the   call   is   in   SetupPhase  when  the  proc
   OnOpenMediaStream is triggered)
   
   
   The  most  important  problem  I'm having right now is that G729 is
   still  not  working (poor quality due to high buffering). Even with
   the  latest  Opal,  which  includes  the last week patch for jitter
   buffer.  If  you  dont  need G729, I could send you a patch for the
   latest svns (freeswitch, opal, ptlib), ofc no founding needed.
   
   There are a couple of bugs in opal itself and h323ing freeswitch
   with opal will bring them in. On the other hand, mod_opal is
   already there, it just needs a few adjustments.

   
Best wishes,

Claudiu Filip




Wednesday, October 7, 2009, 11:37:50 AM, you wrote:
Tihomir> Anthony, 

Tihomir> of course, nobody wants to start anything... we are all here
Tihomir> to help making FS a better product.

Tihomir> so, regarding the founding for mod_opal ... what is the amount you need?


Tihomir> Tihomir.


Tihomir>  
Tihomir>  On Wed, Oct 7, 2009 at 2:58 AM, Anthony Minessale
Tihomir> <anthony.minessale at gmail.com> wrote:
Tihomir>  I didn't mean to start anything.  I'm just saying we work
Tihomir> very long hours and barely get anybody asking about h.323.
Tihomir> I wanted to support it and that's why we took up a
Tihomir> collection to get funding for mod_opal but when only 1 donor
Tihomir> showed any interest we were forced to proceed in our spare time which is very limited.
Tihomir>   
Tihomir> The developers of opal are not part of our project and they
Tihomir> need financial compensation to be motivated to work on it. 
Tihomir> Its not even related to me its only fair that an outside
Tihomir> developer who makes his living as a consultant would want
Tihomir> money to integrate his work into our project.
Tihomir>   
Tihomir> Like I said, I will do my best to point your issue to the
Tihomir> opal devs but I cannot force them to work on it.





Tihomir> On Tue, Oct 6, 2009 at 7:22 PM, Diego Viola
Tihomir> <diego.viola at gmail.com> wrote:
Tihomir>   
Tihomir> Yeah I understand your point of view, but saying "I want a
Tihomir> H.323 module" or "I want a Ferrari" wont magically make it happen.
Tihomir>   
Tihomir> We need to work on it ourselves or pay to the people that
Tihomir> knows how to do it to do it for us.
Tihomir>  
Tihomir> There is no other way I think.

Tihomir> Diego




Tihomir> On Tue, Oct 6, 2009 at 11:41 PM, Tihomir Culjaga <tculjaga at gmail.com> wrote:
Tihomir>   
Tihomir> Diego,

Tihomir> what i'm pointing here is the situation where you have a
Tihomir> great product that lacks in one of most common protocol. It
Tihomir> is true H323 is going to disappear (eventually), it is true
Tihomir> that the community prefers SIP/IAX instead ... but the
Tihomir> reality still remains. H323 is going to be used for quite a
Tihomir> long time to exchange a lot of traffic while FS will be left
Tihomir> aside. Today, when you setup an IP peering interconnection
Tihomir> 80% of carriers will prefer H323.
Tihomir>   
Tihomir> Of course, developing something costs "time" (and we all
Tihomir> know what time stands for...) and as i said, i understand the
Tihomir> financial point of view and i really understand if nobody is
Tihomir> going to work on that, but let's face it FS doesn't have any
Tihomir> usable module to reliably handle H323 protocol. 
Tihomir>   

Tihomir> said that, i don't intend to offend anyone... just facing the reality.


Tihomir> regarding the h323 module, we don't have any issue fixing
Tihomir> the existing or developing a new one... but before we go
Tihomir> developing something it is always better check if the thing
Tihomir> you want already exists in an usable state or not... that's what i did today.
Tihomir>   

Tihomir> So, I'm interested in a reliable module handling H323v4... anyone else?


Tihomir> T.






Tihomir> On Tue, Oct 6, 2009 at 11:45 PM, Diego Viola
Tihomir> <diego.viola at gmail.com> wrote:
Tihomir>   
Tihomir> Instead of complaining and demanding things for free, people
Tihomir> should start to put their money where their mouth is.
Tihomir>   
Tihomir> Diego


Tihomir> On Tue, Oct 6, 2009 at 8:47 PM, Tihomir Culjaga <tculjaga at gmail.com> wrote:
Tihomir>   
Tihomir> hi Anthony,

Tihomir> it is somewhere here:

Tihomir>          switch_status_t
Tihomir> FSConnection::receive_message(switch_core_session_message_t *msg)
Tihomir>   

Tihomir> anyhow, i will open an issue jira of course.


Tihomir> I understand your financial point of view, but anyhow while
Tihomir> the entire world is wants sip and trying to move to sip, the
Tihomir> reality is quite different. The majority of voice traffic
Tihomir> exchanged via IP is still H323. This means a working SIP -
Tihomir> H323 interworking is really needed... pity nobody wants/has
Tihomir> time to work in this direction to produce a decent mod_h323. 
Tihomir>    


Tihomir> T.



Tihomir>  


Tihomir> On Tue, Oct 6, 2009 at 9:25 PM, Anthony Minessale
Tihomir> <anthony.minessale at gmail.com> wrote:
Tihomir>   
Tihomir> pcap is not as useful as FS console log on debug with:
Tihomir> sofia profile internal siptrace on
Tihomir>   
Tihomir> you should be reporting issues to jira under mod_opal not to the mailing list.
Tihomir> http://jira.freeswitch.org
Tihomir>  
Tihomir> FYI
Tihomir> There is little financial support from the community for
Tihomir> h323 which prevents the mod_opal from getting much attention.
Tihomir> We actually have to contract the author of opal to help with
Tihomir> these issues including the original writing of the module
Tihomir> that he did with very little funding and nobody ever wants to pay him to improve it.
Tihomir>   
Tihomir> That does not mean your issue will not be addressed but
Tihomir> there is no promise how fast it will be.



Tihomir> On Tue, Oct 6, 2009 at 12:37 PM, Tihomir Culjaga <tculjaga at gmail.com> wrote:
Tihomir>   
Tihomir> hello guys,


Tihomir>  i was playing with mod_opal to see if i can make it working
Tihomir> ... well it seems SIP-H323 interworking is not tuned at all.
Tihomir>  
Tihomir> I have a call from a registered sip user (1001) to PSTN via mod_opal
Tihomir>   

Tihomir> <include>
Tihomir>   <extension name="EMERGENCY">
Tihomir>     <condition field="destination_number"
Tihomir> expression="^0(112|9[23456])$">
Tihomir>       <action application="set"
Tihomir> data="effective_caller_id_number=1001282122"/>
Tihomir>        <action application="set" data="NCX_IP=10.4.4.254"/>
Tihomir>       <action application="set" data="call_timeout=30"/>
Tihomir>       <action application="set" data="hangup_after_bridge=true"/>
Tihomir>   
Tihomir>       <action application="bridge" data="opal/h323:0$1@${NCX_IP}"/>
Tihomir>     </condition>
Tihomir>   </extension>

Tihomir>   <extension name="SPECIAL_SERVICES">
Tihomir>     <condition field="destination_number"
Tihomir> expression="^0(9[01789]\d{3,4})$">
Tihomir>        <action application="set"
Tihomir> data="effective_caller_id_number=1001282122"/>
Tihomir>       <action application="set" data="NCX_IP=10.4.4.254"/>
Tihomir>       <action application="set" data="call_timeout=30"/>
Tihomir>        <action application="set" data="hangup_after_bridge=true"/>

Tihomir>       <action application="bridge" data="opal/h323:0$1@${NCX_IP}"/>
Tihomir>     </condition>
Tihomir>    </extension>

Tihomir>   <extension name="ENYTHING_ELSE">
Tihomir>     <condition field="destination_number"
Tihomir> expression="^0([2-8]\d{6,7}|0[1-9]\d{7,8}|00[1-9]\d{8,16})$">
Tihomir>       <action application="set"
Tihomir> data="effective_caller_id_number=1001282122"/>
Tihomir>        <action application="set" data="NCX_IP=10.4.4.254"/>
Tihomir>       <action application="set" data="call_timeout=30"/>
Tihomir>       <action application="set" data="hangup_after_bridge=true"/>
Tihomir>   
Tihomir>       <action application="bridge" data="opal/h323:0$1@${NCX_IP}"/>
Tihomir>     </condition>
Tihomir>   </extension>
Tihomir> </include>



Tihomir> One of the many issues i sow is that FS connects the call on
Tihomir> SIP leg before it actually receives H.225 connect from H323
Tihomir> leg... as it is configured to send 200 OK on the 1st H.225
Tihomir> message containing a FastStart element/OLC.
Tihomir>   

Tihomir> Attached is the tcpdump i took on FS machine... just use
Tihomir> this filter: "h225 or h245 or q931 or sip"
Tihomir> Also, you can check the attac CDR,,,, this is an unanswered
Tihomir> call i placed to PSTN and FS billed it 23 seconds.
Tihomir>   


Tihomir> Can anyone tell where i can do correct SIP - H323 message mappings to avoid this?



Tihomir> T.


Tihomir>  

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Tihomir> -- 
Tihomir> Anthony Minessale II

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