Bad sound on calling sip client, not on PlayBack in Asterisk

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What steps will reproduce the problem?
1. Call a Sip user on an Asterisk Box using Red5Phone
2.
3.

What is the expected output? What do you see instead?

The sound is very buggy and sometimes you hear soemthing. When you call to a 
Playback extention, the sound it great and clear.

We have tested this on two systems, two different guys. One had also a bad 
noisy sound on echo() the other one had a great echo() on Asterisk


What version of the product are you using? On what operating system?

- All versions of Red5Phone
- Ubuntu 11.04 with 0.9.1 (and bad echo sound)
- Debian Squeeze with 0.9.1 (and good echo sound)


Please provide any additional information below.


Calling with normal sip clients is good, great quality. At the server side 
there is NO NAT or FIREWALLING involved, direct public IP.

Can this something on the client side with NAT ? If so, it's unusable, but I 
doubt because o fthe clear playback sound.

Original issue reported on code.google.com by yamakasi...@gmail.com on 27 Oct 2011 at 11:45