- In your own words, explain what SIP is and how it’s used. …
- What is the significance of the Call-ID header field? …
- Describe the differences between transactions, dialogs and sessions. …
- Explain the advantages of using SIP URIs and how they compare to IP addresses.
SIP (Session Initiation protocol) Interview Questions | Part – 1
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SIP is a communication protocol that is used for signaling and controlling multimedia communication sessions. HTTP, on the other hand, is a application protocol that is used for transferring data between clients and servers. SIP is designed to be independent of the underlying transport layer, while HTTP relies on TCP. SIP also uses a different message format than HTTP.
Yes, it is possible to enable multiple registrations from different IP addresses on a single SIP account. To do this, you will need to create a separate SIP URI for each IP address that you want to register. Each SIP URI will need to be registered with the SIP server individually.
SDP is a session description protocol that is used to describe multimedia sessions for the purposes of session establishment, announcement, and modification. H264-SVC is a video codec that supports scalable video coding, meaning that it can be used to encode video at different resolutions and bitrates. VP8 is a video codec that is designed for use with the WebRTC protocol. WebRTC is a real-time communication protocol that supports audio and video streaming.
SIP uses a process called message routing to determine where a message should be sent next. Message routing is based on the message headers, which contain information about the sender, recipient, and the route the message has taken so far. SIP uses this information to determine where the message should be sent next, and it can also use it to determine if the message should be forwarded to another server or delivered directly to the recipient.
Authentication in SIP can happen in a few different ways, but the most common is through the use of a username and password. When a SIP client tries to connect to a SIP server, the server will challenge the client to provide a valid username and password. If the client can provide the correct credentials, then the server will allow the connection to be made.
I would expand the list of these interview questions with one more: what is SIP server? A SIP server can build up calls, and also terminate them. You can create SIP accounts on a SIP server if you want to add a certain phone for example (e.g VoIP phone) to a telephone system. I hope this page also helps: http://www.ozekiphone.com/what-is-sip-server-338.html A video is attached to the page as well and it shows what a sip server is and how you ca use it with Ozeki Phone System XE.
The most common questions are. 1) whats a dialog , transaction ? 2) whats is early media ? 3) Whats are record-route and route headers. 4) whats are the sip layers? 5) what is path header ? 6) What are the headers in 181 responce? 7) Whats the significance of via header ? 8) Whats the diffrence between INVITE and Re-INVITE? 9)
Go through the RFC 3665 which will be having basic call flows. And google sip srchitecture,explanation about each device in the architecture like proxy,registrar server etc.different call features call flows like call hold etc.What is the difference between normal invite and invite with hold and unhold?etc differences between sip transaction,caller-id,dialog etc? Hope this info will be useful.
There are no shortcuts, read RFC 3261 thoroughly and mug up all scenarios of a SIP call, you should know all types of methods and headers. Usage of Via header and branch parameter. Why ACK and its significance. Dialog vs Transaction vs Session. How to modify a dialog? When does media starts flowing in a SIP call? What will happen if ACK is lost? How a SIP gateway interacts with SS7 signaling and give its flow end to end. Hope this helps.
FAQ
What is the STAR method in interviewing?
