ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

VoIP Phones - Use of signaling protocol, call manager, and SIP clients

Updated on March 18, 2011

Q. What is VOIP signaling protocol and what it is for?

A. H.323, MGCP, SIP, etc. all are VoIP signaling protocols, but SIP is most widely accepted VoIP protocol. SIP is responsible for establishing, maintaining, modifying and tearing down the RTP session. However, SIP has no concern with RTP, RTP exchange information is handled by SDP (session description protocol).

Q. What is the meaning of CCVP?

A. CCVP covers all the VoIP signaling protocols, which are used by Cisco in their VoIP servers and clients. CCVP focuses mainly on the configuration part of only own products. It also covers Quality of Service (QoS), which is must for real time applications.

Q. Can you explain about call manager and all other devices used to implement VOIP tech?

A. Call manager is not a very generic term in VoIP. Users select the call manager on the basis of requirement. I believe that you can use the call manager, which includes the proxy and registrar server. Asterisk (http://www.asterisk.org) is the most widely used open source call manager (remember, call manager is also the brand of Cisco VoIP server). With call manager such as asterisk, which you can configure on any PC, you also need SIP clients such as IP Phone, Softphone, ATA, etc.

Q. How can I know IP of an IP phone?

A. Every IP phone has different types of user interface. Please check with the IP-Phone manual that you are using. In general, IP phone displays the currently used IP, subnet mask, etc. somewhere on the LCD display.

Q. Do every Ip phone will have IP by default?

A. Yes, every IP phone has default IP.

Q. If so, is that will be a public IP or private IP?

A. Default IP will always be private one.

Q. What exactly a VOIP server does?

A. VoIP (SIP) server is mainly responsible for the following:

REGISTRAR - With the help of register service of SIP, you (SIP Client) register your current location (IP Address of URL) to the SIP server. You can have multiple bindings with the VoIP server. This helps SIP server locate you at the time of incoming call for you.

PROXY - Proxy server is responsible for sending SIP messages to the caller on behalf of you. Proxy interacts with REGISTRAR server to find out the location of the caller and then sends the SIP message to caller. Proxy can be stateless or stateful. Stateless proxy refers to one, which does not maintain your call state. Stateful proxy maintains the call state.

REDIRECT - Redirect server works opposite to what proxy does. If SIP server is configured in redirect mode and you send the SIP message to SIP server to call someone, redirect server returns you to the current location of caller in SIP response and then you yourself can send the SIP message to the caller.

Q. What is SIP and SIP clients?

A. SIP is a signaling protocol. SIP client refers to the soft or hard devices, which can register with SIP server for example IP phones, ATA, VoIP gateways, etc.

Q. What is Quality of Service? One QOS is what we see when we run gpedit.msc in our PC. Is that the same or any other application or what?

A. I will answer this question in my next hub.

Comments

    0 of 8192 characters used
    Post Comment

    • soni2006 profile imageAUTHOR

      Rajinder Soni 

      7 years ago from New Delhi, India

      One way audio is totally useless for a system like VOIP. Thank you so much Graham for sharing this info.

    • profile image

      Graham Allen 

      7 years ago

      You can have issues with SIP behind a symetric NAT. Symetric NAT's are the most common and this link explains why you will expeience one way audio or none at all. http://think-like-a-computer.com/2011/03/14/fix-on...

    • soni2006 profile imageAUTHOR

      Rajinder Soni 

      8 years ago from New Delhi, India

      Thanks a lot Veronica. These were some questions asked by someone via the email to which I have provided answers to via the above hub. I am looking forward to making more hubs on technology in the upcoming days, especially IP phones and voip phones functions, advantages, disadvantages, security, use, and benefits.

    • Veronica Allen profile image

      Veronica Allen 

      8 years ago from Georgia

      Good job sonni2006. I appreciate how you broke things down for us technically challanged individuals.

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com 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: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    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 googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    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)
    Marketing
    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.
    Statistics
    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)