Hi guys,

I configured my sip device and connect it to my network, it was working fine. Then i take it to internet cafe, connect it to internet cafe's network. And i checked cafe's network configuration, and i have seen gateway to reach connection is 192.168.0.3 so i changed it from my device. (gateway was 192.168.0.1 in my network)

That's the only thing i have changed on device settings. But now i have one way voice problem, i can not hear anything but the other side can hear me.

Than i noticed they are using a Mikrotik RB on their network. I am thinking the problem is because of rb.

What should i check or change in RB to solve this?

I had exactly the same problem. I changed the r52nm with an xr2 and everything was fine.

Check this:
http://forum.mikrotik.com/viewtopic.php?f=2&t=54504

I am thinking if RB has sip filter or something like that is being used as firewall where i can check and turn it off in RouterOS?