[asterisk-users] gtalk - no audio

[demuel at thephinix.org]

turning NAT won't give assurance that you get an audio. remember, there are two
protocols involve here. one is sip and the other one is rtp. the rtp protocol is quite
serious to deal with specially if the ports it uses are kinda random and one has to
exert a lot of effort to configure the firewall to allows ranges of ports.

I got both audio both ways. from googletalk buddy to voip phone behind a firewalled
asterisk and vice versa.

> If you are behind a firewall, you may need to turn on NAT in order for
> the RTP to be able to connect to each other.
>
> If you have wireshark or able to get a TCPDump, make the call that
> fails and look at the media anchors.  For me (when I had the exact
> same problem), Gtalk came in with a media port of like 5800 or
> something in that range. I was only looking at 10000 and above. So of
> course, I didn't get bi-directional audio.
>
> Once I changed that rtpstart to 2000, I was able to get things working
> again.  Plus I had to turn on NAT support.
>
> On 6/21/07, Koen Van Impe <koenvi at gmail.com> wrote:
>> I haven't changed rtp.conf from original installation.
>> So the values are:
>> rtpstart=10000
>> rtpend=20000
>>
>> I should maybe give it a try with a lower rtpstart.
>>
>> What do you mean by turning on NAT?
>> Are you referring to parameter "bindaddr" in gtalk.conf? (found that on
>> http://www.voip-info.org/wiki/view/Asterisk+Google+Talk)
>>
>> Thanks already!
>>
>>
>> On 6/21/07, Joseph Bajin <josephbajin at gmail.com> wrote:
>> >
>> > what does your RTP settings look like? I had problems with this at
>> > first. One thing I made sure of was that NAT was turned on and that
>> > the rtpstart in the rtp.conf file was set to 2000 and the rtpend was
>> > up to 20000 (but you can make that much higher).
>> >
>> > Gtalk seems to have a very low RTP port that it uses for media.
>> >
>> > On 6/21/07, Philippe Sultan < philippe.sultan at gmail.com> wrote:
>> > > Hi Koen
>> > >
>> > > > This works fine when I call this account from my personal gtalk. But
>> others
>> > > > have some very strange problems.
>> > > > In most cases, I see the call coming into Asterisk and executing
>> normally.
>> > > > On the callers side, the call looks like it was answered, but there's
>> no
>> > > > audio.
>> > > > In some other cases, the call doesn't even appear to be answered,
>> although I
>> > > > see a normal execution on Asterisk.
>> > >
>> > > Can you please open a bug report that describes your problem, and
>> > > attach an Asterisk debug output for a failed call to the report?
>> > >
>> > > Thanks,
>> > >
>> > > Philippe
>> > >
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