meetme.conf file
[rooms]
conf => 60
extenstions.conf file
[chattest]
exten => 999,1,Answer()
exten => 999,n,MeetMe(60,Dp)
exten => 999,n,Hangup()
sip.conf file
[mark]
type=friend
host=dynamic
context=chattest
[Carla]
type=friend
host=dynamic
context=chattest
when i register both users Mark and Carla through 2 softphones and try to call the number 999, i get call established but the 2 ppl can`t voice chat or hear each other … any ideas??
thanks
[/b]
did you load ztdummy or do you have a zaptel/dahdi device? you need this for timing i don’t know if this causes audio not transmitting but i know you need timing
As the previous post says, you do need a timing source for conferencing to work. So try restarting zaptel as:
/etc/init.d/zaptel restart
It should start ztdummy timer if you don’t have any telephony card. However, as you are able to establish the call, your problem might be somewhere else, like NAT issues (a big topic).
I recommend you that do NOT use names on you sip.conf and extensions.conf
Why? Because it’s more dificult and confuse at the time to modificate your configs data.
I recommend to use numbers, somethings like this
[301]
type=friend
username=301
secret=123
host=dynamic
etc…
Bye and Have a nice day 
GNU.
thx for the help
the problem was that i didnt have the zaptel installed, it needed the ztdummy, problem solved. 
later mates.