How do I implement codec?

[GoogleCodeExporter]

When I call webphone to myred5phone, everything is okey but when I call a
ip based phone.I can hear the person who is at the ip based phone but he
cannot hear me.I think this is codec issue.ip based phone uses g729 and
g711 codec.How can I solve this problem.

my sip server asterisk.operating system is win XP. I use latest sip and
red5 server 0.8.0.

any help will be appreciated.

Original issue reported on code.google.com by fatih0...@gmail.com on 4 Aug 2009 at 5:44

[GoogleCodeExporter]

Hello Fatih,
I don't think that is a codec problem.
by the way, do you have NAT on your network?

Cheers,
Madhawa

Original comment by madhawa1...@gmail.com on 5 Aug 2009 at 8:10

[GoogleCodeExporter]

I do not have NAT in my network but I do not understand that what makes 
difference
whether or not I have NAT.I can call a webphone and audio at both ways.When I 
try
call PBX I can hear the person who at ip based phone it but he can not hear me. 

Original comment by fatih0...@gmail.com on 6 Aug 2009 at 8:40

[GoogleCodeExporter]

is because you are using g729 codec. there's any kind of problem when using 
g729. 
you can check in your asterisk box, type sip show channels and see if your 
channel 
is g729 encoded. if this case, you will hear the one on the other side, but the 
other side will not hear you. I think is a G729 codec compilation.

Original comment by cjr@cyf.com.ar on 10 Aug 2009 at 12:10