Firewall blocking VoIP

A firewall is blocking external calls, a connection to the computer or network that protects it.

Voice over IP (VoIP) calls performed behind a firewall call on a connection and return traffic is expected. Normally block the incoming data firewalls, it is part of a complaint by the protected system. The problem with incoming calls.

Features

Firewall blocks all connections from external sources, unless you are listed in the section "Exceptions" rule basis.

Registered for VoIP application receives the call and the port should be used to as exceptions.

Problem

A user must intend that the firewall restrictions allow the port calls while of the message type.

VoIP applications using SIP (Session Initiation Protocol) Protocol to connect. The SIP system always uses random ports and it is therefore impossible to know what needs ports as exceptions to the computer target lists.

Development

A user must intend that the firewall restrictions allow the port calls while of the message type.

VoIP applications using SIP (Session Initiation Protocol) Protocol to connect. The SIP system always uses random ports and it is therefore impossible to know what needs ports as exceptions to the computer target lists.