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As related to network technology, COS is a 3-bit field that is present in an Ethernet frame header when 802.1Q VLAN tagging is present.The field specifies a priority value between 0 and 7, more commonly known as CS0 through CS7, that can be used by quality of service (QoS) disciplines to differentiate and shape/police network traffic.
Differentiated services or DiffServ is a computer networking architecture that specifies a mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks.
There are two principal approaches to QoS in modern packet-switched IP networks, a parameterized system based on an exchange of application requirements with the network, and a prioritized system where each packet identifies a desired service level to the network. Integrated services ("IntServ") implements the parameterized approach.
Many VoIP service providers offer home and business systems. Both solutions allow users to make and receive calls from any internet-connected device, including cell phones, computers, or VoIP phones.
In computer networking, integrated services or IntServ is an architecture that specifies the elements to guarantee quality of service (QoS) on networks. IntServ can for example be used to allow video and sound to reach the receiver without interruption.
A good rule of thumb (and to make for easy math) for a home phone quality VoIP codec is to assume 100 kbit/s per session multiplied by the number of sessions required at the location. For example 10 sessions of VoIP would require 1 Mbit/s of available bandwidth and 1 Mbit/s of premium QOS to ensure a quality call experience.
pfSense, a firewall/router distribution based on FreeBSD and PF; has QoS that properly tags VoIP traffic and a SIP proxy package that is available for NATed endpoints. Its functionality can be expanded with packages like FreeSWITCH , a free/open source software communications platform for making SIP, voice and chat driven products.
This QoS information is called a flowspec and RSVP passes the flowspec from the application to the hosts and routers along the path. Those systems then analyse the flowspec to accept and reserve the resources. A flowspec consists of: Service class; Reservation spec - defines the QoS; Traffic spec - describes the data flow
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