If your PBX or Network has a firewall you *may* need to open some ports or allow certain IP address for your calls to pass to the TelTel network.
Ports to open:
5060 UDP/TCP (Sip Signalling)
10000-20000 UDP (RTP / Audio)
Sip Signalling IP Address Subnets:
202.52.129.0/24
103.5.76.0/24
Special Notes:
In most cases you may not need to open your ports or allow specific IP addresses
It is important that before you make any changes to your firewall you consult the person, department or company responsible for your network firewalls operation.
