[Asterisk-Dev] SIP RTP JitterBuffer in Asterisk

[Matt Hess]

# gcc -v
Reading specs from /usr/lib/gcc-lib/i386-unknown-openbsd3.6/2.95.3/specs
gcc version 2.95.3 20010125 (prerelease, propolice)

my results:
An unpatched head system calling an external milliwatt number is nice 
and smooth. (good benchmark call)

A head system with the latest patch on the same call is horrible. I've 
tried using both the default variables/settings and modifying them to no 
avail. Turning the jitter buffer off in sip.conf yields the same smooth 
call.

in tinkering further with the settings in sip.conf:

usejb=yes
jbsize=300
forcejb=no
jblog=yes

yields a good call but I note that I get the following log message:
-- ***[RTP JB LOG]*** Detected bridged channel that can accept jitter. 
Disabling the jitterbuffer.

with:
usejb=yes
jbsize=300
forcejb=yes
jblog=yes

message log:
-- ***[RTP JB LOG]*** Jitterbuffer created and started. jb_alloc=1.
-- ***[RTP JB LOG]*** Jitterbuffer created and started. jb_alloc=2.

and again the call is complete crap..


The call itself is a gsm codec call transcoded to ulaw.. gsm on the 
external side and ulaw going to a bt-100 sip phone. The asterisk server 
has 2 network interfaces.. one public and one private. The bt-100 is on 
private ip space.


Slav Klenov wrote:
> What version of gcc you are using? With 3.4.4 this compile pretty well. 
> Actualy its a C++ style and some more strict compilers (including some 
> gcc versions) generate an error.
> 
> 
> Matt Hess wrote:
> 
>> I get a compile error.. did a fresh cvs get of asterisk and applied 
>> patch cleanly.
>>
>> gcc -pipe  -Wall -Wstrict-prototypes -Wmissing-prototypes 
>> -Wmissing-declarations -g  -Iinclude -I../include -D_REENTRANT 
>> -D_GNU_SOURCE  -O6 -march=i386  -pthread           
>> -fomit-frame-pointer    -c -o rtp.o rtp.c
>> rtp.c: In function `rtp_jb_destroy':
>> rtp.c:877: syntax error before `int'
>> rtp.c:882: `len' undeclared (first use in this function)
>> rtp.c:882: (Each undeclared identifier is reported only once
>> rtp.c:882: for each function it appears in.)
>> gmake: *** [rtp.o] Error 1
>>
>>
>> Slav Klenov wrote:
>>
>>> New SIP jitterbuffer patch against today cvs-head is available on 
>>> mantis:
>>>
>>> http://bugs.digium.com/view.php?id=3854
>>>
>>>
>>> Slav
>>>
>>> Olle E. Johansson wrote:
>>>
>>>> Matt wrote:
>>>>  
>>>>
>>>>> Hi,
>>>>> I heard talk that there was a SIP RTP JitterBuffer which was either in
>>>>> asterisk CVS, or was being made as a patch here on the dev list.   Can
>>>>> anyone confirm this or deny it?  And if it exists, what is the current
>>>>> status of it?
>>>>>   
>>>>
>>>>
>>>>
>>>> At this point, a lot of work is going on to fix this. We do not know if
>>>> we can fix it in due time for 1.2. There are non-working patches in the
>>>> bug tracker, but rumour (a less than one hour old rumour) tells me that
>>>> something is working out there. Nothing is included in CVS at this 
>>>> point.
>>>>
>>>> A bit longer answer than "no" this second time :-)
>>>>
>>>> /O
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>>>
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> 
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