[asterisk-dev] IAX2 and jitterbuffer problems

[Pavel Jezek]

Russell Bryant wrote:
> Pavel Jezek wrote:
>   
>> - not working when bridge two channles with different jb implementation 
>> - eg. sip/h323/skinny & iax
>>     
>
> I'm not exactly sure what you mean here.  You generally don't want to use a
> jitterbuffer in this situation.  You only want to use it at the endpoint.
>   
I have excessive jittery connection (wifi/cdma), endpoints (eg. ci$co 
phones/gateways) can't cover this excessive jitter, I must dejitter on 
asterisk and send to endpoint with smaller jitter...
I think dejittering is also needed before codec translation eg.:
sipA--(jittery 
connection)--(iLBC)asterisk1(alaw)----iax----asterisk2---(alaw)sipB
I think, to be efective plc codecs algorithm, I must dejitter _before_ 
dojing codecs translation, so I must dejitter on asterisk1, not 
asterisk2 or even endpoints...
but it's not possible, because bridging channels with different jb 
implementations (sip vs. iax) on asterisk1
all this will be clearly solved, when jb will be efective in incomming 
direction on _incomming_ channel, as many people expected
I think, kind of currently designed jb in asterisk is confusing for many 
people....

>   
>> - jb is applied in incomming direction, but on _outgoing_ channel! :-\
>>     
>
> I wrote a patch yesterday that allows this to work, even when connecting to an
> Asterisk application such as Voicemail or MeetMe.  See this post for more details:
>
> http://russellbryant.net/blog/?p=17
>
>