ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

VoIP and DSCP Settings

Updated on April 24, 2012
IP Packets and VoIP QoS
IP Packets and VoIP QoS

QoS for VoIP

VoIP data on the Internet falls into a special category of traffic. Of course, when the Internet first started out almost everything was text. With the emergence of media like audio and video, new management techniques had to be devised to deal with them. For example, buffering allows a device to obtain a certain amount of media information before it starts running what it has so that minor disruptions down the line can be covered up by playing what has already been received. However, VoIP is even more special. This is because unlike other types of traffic, it is real-time. A person listening at one end of a call has to hear what the other person says as soon as possible.There's no space for extensive buffering or traffic management delays. This is why when using VoIP, users need to tell their computer networks to prioritize VoIP data over all others. This can only be achieved using Quality of Service or QoS systems.

This QoS can be implemented in a variety of ways. One technique is called Differentiated Services Code Point or DSCP. This is merely an implementation in the header area of IP packets related to VoIP which allows networks to understand that it's high-priority and needs to be delivered as quickly as possible.

SIP With DSCP Settings

As we have seen before, VoIP traffic using SIP is divided into two types. The first is when the connection is being set up using the SIP protocol involving the standard ports. The second, is when the actual communication takes place using the RTP protocol. These two types of packets have very different purposes and they need to be treated differently as well. The first is a control packet related to signaling and the second relates to media.

DSCP is a protocol which involves placing a number in a specific field in the IP packet that allows network components to recognize what it's meant for and how it has to be treated. A DSCP value of 25 for example lets the network know that the packet is low bandwidth but requires quick travel times. This should be used for control packets like SIP. On the other hand, the DSCP value of 46 implies that it is latency sensitive and networks are meant to provide a Best Effort or BE treatment to them. If you're on a wireless network and Wi-Fi for example, a value of 48 to 63 tells the network that the package is high-priority.

QoS settings for VoIP are very important to ensure that routers and devices recognize the real-time nature of the traffic and deliver it to you as soon as possible. This will help reduce latency, jitter, and lag. SIP account management can also include the setting up of QoS rules on the router and SIP clients. Contact your hosted VoIP system provider to find out what the ideal QoS settings need to be for you.


    0 of 8192 characters used
    Post Comment

    No comments yet.


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)