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Applications using the twilio voice sdk need to be connected to the twilio infrastructure in order to get a chance to take care of and receive calls. As shown in the diagram below, two types of connections are required: signal and multimedia. The signal connection is a secure tls connection that is used to exit and acquire the control information analysis of call settings. Multimedia connection is a secure srtp (secure real-time transport protocol) connection that is used to exit and reach audio. Twilio's programmable voice infrastructure is deployed in the edge social network in all countries. By default, sdks use global low latency (gll) to establish the optimal twilio edge to connect to. Firewall configuration In a typical organization network setup, the hosts firewall from the world wide web is used to protect the local network. Firewalls are configured using rules to block or authenticate traffic on the internet-points of intent and from them based on direction, protocol and ip address. In order to get access to twilio, your firewall must allow outgoing tcp and udp traffic from your programs to the twilio infrastructure and solve the reverse traffic in a rebuke. Twilio will definitely not be able to initiate attachment to sdk applications. Therefore, the firewall is not responsible for allowing connections initiated from outside to return to the internet. In such sections, waiting for connection, [buy mumble] the necessary ip links and destination ports are listed. Your firewall must be configured to allow access to media servers and alarm gateways corresponding to the sdk you are using.