Hi All,

I should have some time to work on this by the end of the week. 

Our asterisk setup makes it hard to reproduce the problem,  so we installed a 
new asterisk server in a testing environment. 
However, the server is on the local network, we should consider moving it on 
the wan, 

Thanks all for the recent useful feedbacks. These are most helpful. I notice on 
my side that, using g722, the first call fails but the second succeed. 
This seems to confirm that the problem reside in codec initialization.    

Regards,

Alexandre

----- Original Message -----
From: "Jan Middelkoop" <[email protected]>
To: [email protected]
Sent: Monday, February 7, 2011 10:19:15 AM
Subject: Re: [SFLphone] the other site can't hear me - not NAT/FW problem

I think I can confirm this.  The problem I e-mailed about this morning 
(sound stopping when a call is answered) was resolved when I switched 
asterisk to use ulaw instead of alaw.

Kindest regards,
Jan Middelkoop

Met vriendelijke groeten,
Jan Middelkoop
ICT beheerder Recreatie&  Zorg Groep

Website: http://www.recreatie-zorg.nl/
E-mail: [email protected]
Telefoon: +31 10 714 2297


Op 3-2-2011 15:30, kapetr schreef:
> Hello,
>
> Besides the persistent problem of often missing output RTP stream, I
> have
> a new problem since (+- ? - maybe from begin of time)
>
> snapshot20110119 version. (Now I'm using 30.1.2011 version)
>
> Even if both (input/output) RTP streams seems to be OK, the other
> site can't hear me (in most cases).
>
> Interesting is, that if I record this call, then in recorded WAV are
> both sides to hear.
>
> After many tests I thing, the problem is in codecs mishmash.
>
> What ever I set by my account as allowed codecs, SFLPhone uses as
> output codec PCMU (= 711u).
>
> e.g.
> 1. I set as only codec GSM
> 2. I make call (in INVITE is only GSM codec listed - OK)
> 3. The other side accepts this codes (in ACCEPT is also only this
> GSM codec - OK)
> 4. the other side sends to me RTP stream in GSM  codec - OK, but
> I send RTP in 711u (PCMU) codec !  - ERR  ->  The other side do not
> hear me.
>
> Tested by 2 different providers - iptel.org and mikrotech.cz.
>
> The same problem is if I allow more codecs (inclusive 711u) - if the
> 711u is not selected as first, the other side accepts my list and
> sends to me in 1. listed codec (e.g. 711a, GSM, ...), but I send
> again in 711u. And  other side do not hear me.
>
> Also - SFLPhone MUST by outgoing call send RTP stream in 1.codec
> listed in ACCEPT session description (which is in ideal the same as
> the 1. in INVITE list).
>
> --kapetr
>
> P.S.: is there any chance to repair the "missing output RTP stream
> persistent problem" ?
>
>
>
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