Interview Questions.

Question 1. What Is Voice Over Internet Protocol (voip)?

Answer :

VoIP stands for Voice Over Internet Protocol or Voice Over IP. VoIP is the technique by means of which you may ship your voice (analog data) over the Internet (digital facts) to an cease-person who gets the message.

Question 2. How Does Voip Work?

Answer :

A VoIP gateway converts the analog voice information into digital statistics packets that are sent over a broadband Internet connection to a VoIP server that forwards the message to the receiving birthday celebration.

CCNA Interview Questions
Question three. How Can I Use Voip At Home?

Answer :

You can use VoIP at home currently with a unfastened utility including Skype which lets you talk from your PC to any other person who additionally has Skype on their PC at no cost everywhere within the global. You also can get a VoIP smartphone with a VoIP provider company or you could use your normal telephone with a VoIP telephone adapter plus a provider issuer.

Question four. I Am In Business And Would Like To Replace My Corporations Current Pbx System With Voip. Is This Possible?

Answer :

Yes, many organizations are doing just this. VoIP is a very cost-powerful approach for corporations who need to improve their antique PBX systems and VoIP permits for brand spanking new features that conventional PBX structures certainly do not. Also VoIP web conferencing has come of age and also gives cost financial savings and plenty of new functions not to be had with traditional internet conferencing techniques.

WebRTC Tutorial
Question 5. When Can I Replace My Cell Phone With A Voip Phone?

Answer :

Most probable in the subsequent couple of years. Right now mobile phone provider providers are developing mobile phones that may roam for Wifi VoIP or traditional networks if you want to provide you with the best savings structured upon area. Wifi hotspots, but, do now not currently cover as a whole lot location as cellular does, so it will take carriers some time to paintings this difficulty out.

CCNP Interview Questions
Question 6. What Is The Biggest Disadvantage To Going Voip With My Home Phone Right Now?

Answer :

The biggest downside is that currently all VoIP vendors to now not provide emergency 911 carrier in all areas. The FCC has recently ruled though that that is a mandatory requirement that ought to be completed with the aid of September 2005.

Question 7. What Kind Of Equipment Do I Need?

Answer :

A broadband Internet connection. You can use a ordinary phone, as long as you connect it to an adapter. However, organizations along with Cisco Systems Inc. Now make VoIP telephones that don't require adapters. The adapter or new VoIP phone connects to a broadband modem. Some VoIP vendors can link to a whole domestic's wiring so adapters aren't required at each extension.

SIP Tutorial Cisco Interview Questions
Question eight. Is The System As Reliable As The Old-long-established Network?

Answer :

Early VoIP services often sounded tinny, delayed or digitized. In latest years, the era has gotten a great deal better, and Guzman & Co. Analyst Pat Comack stated it might not be lengthy before it achieves the tech enterprise's vaunted "5 9s" stage -- 99.999 percent reliability. For now, VoIP won't be ideal, however cell phones have made human beings extra accepting of less-than-best sonic situations.

Question nine. How Does Voip (voice Over Internet Protocol) Work? What Makes It Different From Traditional Phone Service?

Answer :

Traditionally, a telephone communication is transformed into digital signals that traverse an tricky network of switches, in a devoted circuit that lasts the duration of a name. In Voice over Internet Protocol, a communication is converted to packets of facts that flit all around the Internet or private networks, similar to e-mails or Web pages, though voice packets get precedence repute. The packets get reassembled and transformed to sound on the alternative cease of the call.

Cisco Nexus switches Interview Questions
Question 10. What Are Some Disadvantages Of Voip?

Answer :

If you are thinking about changing your traditional telephone carrier with VoIP, there are some viable differences: 

Some VoIP offerings do not paintings at some stage in power outages and the service company won't offer backup strength. 
Not all VoIP services join at once to emergency services through 9-1-1. 
VoIP providers may also or won't offer listing assistance/white web page listings.
 

Question eleven. What Do Internet Telephony,packet Telephony, Ip Telephony And Converged Network Means?

Answer :

The first thing all suggest the same thing. Which is the usage of IP (Internet protocol) for voice offerings. Some voice networks are only packet-switched and have no get entry to outdoor in their own VoIP community. Most VoIP networks have a Gateway that connects to a circuit-switched external network which offers them acces to external calling. One of the gateways responsibilites is to transform G.711 Circuit-switched media (generally a T1 provided by means of a telco enterprise) to the 7.723 Packet-switched media with a purpose to traverse the corporations VoIP community. A device called a gatekeeper will then convert the IP address (utilized by H.323 protocol) to a popular cellphone wide variety (E.164 address) that may be used for outside calling. 

A converged community is a community that passes both Voice and Data over the same set of gadgets. Converged networks normally implement QoS (Quality of provider) on all actived community gadgets to make sure the VoIP has precedence over wellknown facts due to it is extra inflexible needs.

WebRTC Interview Questions
Question 12. What Equipments Are Needed For Voip?

Answer :

Generally following things are required for voip 

Broadband connection 
voip phone 
nexton softswitches 
router 
audiocodec 
astric server
 

CCNA Interview Questions
Question 13. What Are The Advantages To Voip?

Answer :

The massive advantage is VoIP may save you money relying on how much you're currently spending for local and lengthy-distance calls. What you may need to do is get the total value the smartphone enterprise is charging and evaluate it towards a VoIP plan that pursuits you. With most plans, you get free calls in the U.S. And Canada for an extremely low flat price. International calls normally have very low costs with no connection charges. For each residential customers and organizations that make a number of long distance and worldwide calls, the financial savings can be numerous hundred greenbacks a yr. 

Another advantage is with the functions available with VoIP. Features including caller ID, call ready, call forwarding, three way conferencing and voice mail are normally included at no greater cost. With the telephone organization, these offerings are normally extra. 

In addition, you could make free cellphone calls anywhere there is a high velocity Internet connection to be had. That method you may be in any other state or even in another country and make calls as in case you have been returned at your home or commercial enterprise. You will simply want to carry your smartphone adapter at the side of you and in all likelihood a phone in case one isn't available.

Question 14. Which Protocols Describe Voip Connections?

Answer :

VoIP has been carried out in numerous approaches the use of each proprietary protocols and protocols primarily based on open requirements. You can see the VoIP protocols beneath:

H.323
Media Gateway Control Protocol (MGCP)
Session Initiation Protocol (SIP)
H.248 (additionally known as Media Gateway Control (Megaco))
Real-time Transport Protocol (RTP)
Real-time Transport Control Protocol (RTCP)
Secure Real-time Transport Protocol (SRTP)
Session Description Protocol (SDP)
Inter-Asterisk eXchange (IAX)
Jingle XMPP VoIP extensions
Skype protocol
Teamspeak
Question 15. What Do Internet Telephony,packet Telephony,ip Telephony And Converged Network Means?

Answer :

The first element all mean the identical thing. Which is using IP (Internet protocol) for voice services. Some voice networks are handiest packet-switched and don't have any get entry to out of doors in their own VoIP network. Most VoIP networks have a Gateway that connects to a circuit-switched outside community which gives them acces to outside calling. One of the gateways responsibilites is to transform G.711 Circuit-switched media (commonly a T1 provided with the aid of a telco agency) to the 7.723 Packet-switched media so that it will traverse the companies VoIP network. A tool referred to as a gatekeeper will then convert the IP address (utilized by H.323 protocol) to a trendy telephone wide variety (E.164 cope with) that may be used for outside calling.

A converged network is a community that passes both Voice and Data over the equal set of gadgets. Converged networks generally implement QoS (Quality of carrier) on all actived community gadgets to make certain the VoIP has priority over preferred records due to it's extra inflexible demands.

Cisco Unified Computing System Interview Questions
Question 16. How To Get Started On Voip Programming?

Answer :

The nice manner for developing any VoIP utility is the usage of a VoIP development kit. These SDKs are meant to offer a heritage support for your VoIP project by means of presenting prewritten VoIP components. It is quite powerful and cozy to apply these prewritten components, as you can save time and money as well. (During the softphone improvement with the intention to be described below, Ozeki VoIP SIP SDK has been used for this motive, that helps all the .NET programming languages, so C# as nicely.)
For using these toolkits, you have to upload your preferred SDK as reference in you IDE. After you have got added it, you can reach all VoIP components which can be wanted which will outline the behaviour of such VoIP applications as softphones, call recorders, IVR menu systems, software-primarily based IP smartphone structures (PBX), and so forth.

Question 17. How To Make Voip Calls?

Answer :

In order with a view to make voice calls by the use of your own software utility you want to attach your machine to the cellphone network. This can be finished in three approaches:

Option #1: Use a VoIP phone adapter

A VoIP cellphone adapter is a hardware device that may be connected for your Ethernet LAN or in your PC. There are VoIP cellphone adapters for GSM lines, for general analog cellphone lines and for ISDN strains. When you join this hardware in your Ethernet LAN, it will acquire an IP deal with. You want to configure this IP deal with for your VOIP SDK.

Option #2: Use a SIP Account furnished by way of VoIP cellphone service issuer

There are many VoIP smartphone service vendors worldwide that offer telephone carrier over the Internet. You need to join their carrier, and you'll acquire a SIP account (along with an IP cope with, a username and a password). You want to configure the SIP account details for your VoIP SDK.

Option #3: Use your existing workplace PBX if it's far a VoIP gadget.

If you already have an IP phone gadget, you want to attach your VoIP SDK to that over the LAN. The SDK can log in to the telephone machine by using the usage of a SIP account and it can make smartphone calls much like another

Apache Tomcat Interview Questions
Question 18. Is Voip Service Secure?

Answer :

Traditional smartphone strains may be wiretapped, however this calls for physical get entry to and installation effort. VoIP communications, alternatively, may be snooped over the Internet electronically. Network attackers can likewise disrupt your calls by means of interfering with the flow of facts packets.Ensure domestic network security structures are in region to minimize safety issues with VoIP.

CCNP Interview Questions
Question 19. How Good Is The Sound Fidelity Of Voip Service?

Answer :

When the network is functioning properly, VoIP sound pleasant is fantastic. So correct, in truth, that some VoIP carrier providers sincerely inject unique sounds (called "comfort noise") into the transmission, so that callers don't mistakenly think the relationship is useless.

Question 20. Does Subscribing To Internet Voip Service Require Changing Phone Numbers?

Answer :

No. Internet telephones help wide variety portability. Those switching from normal cellphone carrier to VoIP provider can commonly maintain their same wide variety. Note, however, that VoIP vendors are typically now not the ones chargeable for switching your old telephone wide variety over to their carrier. Check together with your nearby phone agency as a few might not support more than a few switch.

Avaya Manual Testing Interview Questions
Question 21. What Kind Of Internet Service Is Needed For Voip?

Answer :

VoIP provider vendors provide their solutions over most varieties of broadband Internet.
A usual VoIP name only calls for approximately a hundred Kbps for excellent exceptional. Network latency glaringly ought to be stored low for digital smartphone calls to hold precise sound nice; VoIP over satellite tv for pc Internet can be elaborate, for instance.

Question 22. What Is Voice Circuit?

Answer :

It is specifically used for voip best as it have ports allow on it which allow voip traffic.

Question 23. What Is Pvdm And What Is The Use Of It?

Answer :

 PVDM stands for Packet Voice DSP (virtual signal processor) Module and it enables Cisco Integrated Services Routers to provide excessive-density voice connectivity, conferencing, and transcoding abilities in Cisco IP Communications solutions.

Cisco Network Engineer Interview Questions
Question 24. What Is Voip Gateway And Explain The Basic Features Of It?

Answer :

A VoIP gateway works as a bridge among an IP community and the PSTN. It converts analog telephony signals to digital.

VoIP gateways encompass the following functions: Call routing, packet processing and manage signalling managementVoice and fax compression/decompressionExternal controller interfaces, for instance to a tender transfer, billing device or network management gadget

Cisco Interview Questions
Question 25. What Is The Difference Between Mgcp & H.323 Voice Gateways?

Answer :

MGCP :  Uses clean textual content for name controlUses a customer-server modelIdeally positioned for provider carriers (centrally located call sellers)Centralized management and control (Dial plan, etc.)Enhanced call survivabilityBetter feature interplay with capabilities like Caller-IDSupport of QSIG supplementary services with CCM.

H.323 : Uses Abstract Syntax Notation 1 for name manipulate messagesUses a peer-to-peer modelScales properly in an enterpriseFractional PRI supportCaller-ID guide on analog FXOMany more TDM interface kinds and signallingGateway-resident applications like TCL and VXMLCAC network design with H.323 GatekeepersNo launch dependencies among GWs and CCMCall upkeep for SRST on PRIsNFAS help

Question 26. What Is The Difference Between Transaction, Dialog And Session?

Answer :

Transaction: A Transaction refers to a fundamental unit of message exchange, between the SIP consumer dealers.; It essentially consists of a request-reaction cycle.

Dialog: A peer-to-peer dating between two use marketers. It is normally created via generations of SUCCESSFUL final response.

Session: A Session refers back to the trade of media between  or greater endpoints.

SIP Interview Questions
Question 27. What You Will Do If You Get A Crackling Sound On Voip Line While Talking?

Answer :

Often we get this form of issue with analog phones which create a crackling sound when you communicate, but isn't always commonplace for VoIP issuer or internet connection as virtual structures don’t generate feels like this. It’s best feasible that it may be from the person on the alternative cease who's also on an analog phone line but if this takes place with specific people then it’s likely your telephone. Try to replace the phone.

 

Cisco Nexus switches Interview Questions
Question 28. What Is Slrg & Why Do We Use It?

Answer :

SLRG (Standard Local Route Groups) gets rid of the pairing among the gateway and the Route Pattern, thus developing a greater flexible technique of selecting a PSTN gateway.
Because it reduces the variety of course patterns that want to be created in line with usa, a huge amount of administrative overhead can be stored, mainly for groups with a big number of web sites.

 

Question 29. What Is The Basic Difference Between Voip And Pots (undeniable Old Telephone Systems) Dial-peers?

Answer :

VoIP dial friends course calls to other VoIP systems through IP protocol where POTS dial peers route calls to legacy PBX systems through local ports which can be analog (like FXS, FXO) or digital (like E1/T).

Voip Telephony Interview Questions
Question 30. What Is Sip Trunk And What Are The Basic Benefits Of Using Sip Trunk?

Answer :

SIP Trunk is a voice name connection positioned over your Internet connection. This VoIP “trunk” (or telephone line) connects to a issuer who routes your calls via their gateway and usually has very reasonably decrease fees on long distance calls, international calls and in-certain toll free calls.

Additionally, SIP trunks can carry immediate messages, multimedia conferences, user presence data, and Enhanced 9-1-1 (E9-1-1) emergency calls.

Eliminate BRI and PRI subscription fees because SIP trunk related without delay to an Internet telephony provider company.
Eliminate IP-PSTN gateways (or maybe your entire PBX)
Low fee long distance calls, global calls, and many others.
Expansion of traces is dependent on bandwidth, that can without problems be extended if wanted. It way that with SIP trunking you don’t want to shop for strains in blocks of 24 or 32. Instead, you could buy the bandwidth you need in smaller increments.
Question 31. What Is The Difference Between E1 And T1 Link? In Which Country Are We Using T E1 And T1 For Digital Transmission?

Answer :

The most important distinction between E1 and T1 is the statistics price. T1 has a records price of one.544 mbps and E1 has a information fee of two.048 mbps.

Other differences among T1 and E1 lies inside the wide variety of channels (E1-32 Channel and T1-24 channels) but velocity (64 kbps) remains the same for each links: can be for inter – connection between the E1 and T1 traces. This is interconnected because it's far used for worldwide connectivity functions.

T1 is used particularly within the United States, Canada, Hong Kong and Japan. E1 is more often than not used in Europe.

Question 32. How Many Channels Are In E1 And T1 Link? What Is The Operational Bandwidth Of Each Channel In Each Link?

Answer :

E1 link consists of 32 channels in which T1 link consists of 24 digital channels and each channel of both T1/E1 gives you 64 kbps bandwidth.

An E1 hyperlink consists of 30B channels and 1D channel and every channel has 64k Bw.

So for E1 – you get 30*64 = 1920kbps.

A T1 hyperlink includes 23B channels and a D channel and every channel has 64k Bw. So for T1 – you get 23*64 = 1472kbps

Cisco Collaboration Engineer Interview Questions
Question 33. What Is The Signalling And What Is The Difference Between Cas And Css?

Answer :

Signalling is a manner of records exchange to status quo and manage of a telecommunication circuit and the management of the network.

Common channel signalling (CAS) makes use of a committed channel for the signalling where Channel Associated Signalling (CAS) conveys signalling data regarding a couple of bearer channels. These bearer channels therefore have their signalling channel in common.

CCS with E1 =30 B channels and 1 D channel
CCS with T1 = 23 B channels and 1 D channel
CAS with E1 = 31 B Channels
CAS with T1 = 24 B Channels
B=Bearer channels accountable for sporting voice signal
D=Data channel accountable for signalling manage

WebRTC Interview Questions
Question 34. What Are The Basic Differences Between G711 And G729 Codec?

Answer :

G729 is a compressed audio codec with higher tolerance for packet loss and jitter than G711. G729 uses 33 Kbps of bandwidth whereas G711 makes use of 87 Kbps. G729 is compressed however nonetheless sounds excellent in poor network however G711 sounds higher handiest with precise community conditions.