port forwarding (voip) not working
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port forwarding (voip) not working
Region : Greece
Model : TD-W8961NB
Hardware Version : V2
Firmware Version : 2.0.0 120823
ISP : otenet
The problem is that the voip is not working. I have 2 offices with adsl connection. A is the central office and B is the branch office. The installation is old with deferent ADSL modem-router(Zyxel). The zyxel at the A office was damaged so i had to change it with Tp-link. The potology with ip and cables is the same. I tested the port forward for voip (port 1720) with telnet from outside of the office and responds correct. When i try to call from the A office to B office it seems that i can not connect. When i call from B office to A office the phone is ringing and i can not hear office B but office B hear office A. When i use the old modem router at the office A everything is working fine but the modem-router works just for a while so i have to change it. I closed the firewall but the problem is still the same. I talked with the local distributor and they tolded me that i have to correct the configuration. At the interface setup is chosed the dynamic at the section get ip and not static as i should do. The is a problem there. The configutation asks me the subnet mask and gateway. I do not know the subnet mask and either the local distributor and the local internet provider cannot help me. The internet provider told me to use at the subnet mask 255.255.255.240 and at the gateway the ip of the router. I did that but when i did i lost the internet connection. Do you have any suggestions?
I have to mention that i make some other port forwards to my SBS2003 server and like remote desktop, vpn connections and https that works fine. The only prolbem is with the vpn port forwarding.
Thank you in advance
Model : TD-W8961NB
Hardware Version : V2
Firmware Version : 2.0.0 120823
ISP : otenet
The problem is that the voip is not working. I have 2 offices with adsl connection. A is the central office and B is the branch office. The installation is old with deferent ADSL modem-router(Zyxel). The zyxel at the A office was damaged so i had to change it with Tp-link. The potology with ip and cables is the same. I tested the port forward for voip (port 1720) with telnet from outside of the office and responds correct. When i try to call from the A office to B office it seems that i can not connect. When i call from B office to A office the phone is ringing and i can not hear office B but office B hear office A. When i use the old modem router at the office A everything is working fine but the modem-router works just for a while so i have to change it. I closed the firewall but the problem is still the same. I talked with the local distributor and they tolded me that i have to correct the configuration. At the interface setup is chosed the dynamic at the section get ip and not static as i should do. The is a problem there. The configutation asks me the subnet mask and gateway. I do not know the subnet mask and either the local distributor and the local internet provider cannot help me. The internet provider told me to use at the subnet mask 255.255.255.240 and at the gateway the ip of the router. I did that but when i did i lost the internet connection. Do you have any suggestions?
I have to mention that i make some other port forwards to my SBS2003 server and like remote desktop, vpn connections and https that works fine. The only prolbem is with the vpn port forwarding.
Thank you in advance
