Common VoIP connections

1. Some ports are often used, VoIP Devices.A of different protocols VoIP (voice over IP) are associated with each by default uses a separate connection.

In addition, many services use ports other than the defaults for the VoIP service. This can be confusing for those that want the router firewall or NAT for your VoIP phone operating parameters to transfer a few standard ports.

SIP

SIP is an acronym for Session Initiation Protocol runs on port 5060 and is the main port, you need to send and receive pass calls must.

Such as Vonage services use a port in the range of 5060 to 5070, while many other vendors keep VoIP service only 5060 and 5061. SIP is the international standard for multimedia sessions this opened port can be transferred already via some routers.

H. 323

H. the international standard for multimedia conferences over the Internet is 323.

It is used by the VoIP products and products like NetMeeting videoconferencing solutions. H. 323 1718 ports 1720 and port use 2517.

Media Gateway control

H. 248 or MEGACO and MGCP (Media Gateway Control Protocol) port 2427 and 2944 running.

Gateway controls are part of the internal composition of the PSTN (public telephone network dial-up, also known as the "plain old telephone service or POTS") that allows VoIP gateway interact with traditional telephone networks.