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SIP
SIP terminology
51
Computer Networking
Professional
06/22/2012

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Cards

Term
SIP
Definition
Session Initiation Protocol (a peer to peer protocol)
Term
UAC
Definition
User Agent Client
Term
UAS
Definition
User Agent Server
Term
What layer of the IP suite does SIP belong to?
Definition
Application Layer
Term
What 3 protocols can SIP run on?
Definition
TCP, UDP, and SCTP
Term
SCTP
Definition
Stream Control Transmission Protocol
Term
URI
Definition
Uniform Resource Identifier. Identifies each resource on a SIP network (such as a voicemail box)
Term
What is the URI scheme used for SIP?
Definition
sip:
Term
What is the URI scheme if secure transmission is required?
Definition
sips:
Term
TLS
Definition
Transport Layer Security. Used at every hop through which a SIP transmission is forwarded
Term
Sip typically uses TCP or UDP on what port numbers
Definition
5060 (for non-encrypted traffic) and 5061 (for encrypted traffic)
Term
SIP's 4 primary functions are:
Definition
Call signaling,call setup, call teardown, and modifying existing calls for voice and video
Term
Voice and video stream communications are carried over what Application-layer protocol?
Definition
RTP
Term
RTP
Definition
Real-time Transport Protocol
Term
Parameters (codecs, protocols, port numbers) for media streams are defined and negotiated by what protocol
Definition
SDP
Term
SDP
Definition
Session Description Protocol (transported in the SIP packet body)
Term
PSTN
Definition
Public Switched Telephone Network
Term
ITU
Definition
International Telecommunication Union
Term
Name 3 other VoIP signaling protocols
Definition
MEGACO, H.323 and MGCP
Term
MGCP
Definition
Media Gateway Control Protocol
Term
UA
Definition
User Agent: a logical network endpoint used to create or receive SIP messages and manage a SIP session
Term
Proxy Server
Definition
An intermediary entity that acts as both a server (UAS) and a client (UAC) for the purpose of making requests on behalf of other clients.
Term
Registrar
Definition
A server that accepts REGISTER requests so that a location service can register IP addresses to a certain SIP URI
Term
Redirect Server
Definition
A User Agent that generates 3xx (redirection) responses to requests it receives, directing the client to an alternate set of URIs
Term
SBC
Definition
Session Border Controller
Term
Session Border Controller
Definition
Serves as a middlebox between a UA and a SIP server for things such as network topology hiding, and assistance in NAT traversal
Term
Gateway
Definition
Used to interface a SIP network to other networks, such as the PSTN
Term
REGISTER
Definition
used by a UA to indicate its current IP address and the URLs for which it would like to receive calls
Term
INVITE
Definition
Used to establish a media session between User Agents
Term
ACK
Definition
confirms reliable message exchanges
Term
CANCEL
Definition
terminates a pending request
Term
BYE
Definition
Terminates a session between 2 users in a conference
Term
OPTIONS
Definition
requests information about the capabilities of a caller, without setting up a call
Term
PRACK
Definition
Provisional Response Acknowledgement. Imporves network reliability by adding an acknowledgement system to the provisional responses (1xx)
Term
Provisional 1xx (SIP response code)
Definition
request received and being processed
Term
Success 2xx
Definition
The action was successfully received, understood, and accepted
Term
Redirection 3xx
Definition
further action needs to be taken to complete the request
Term
Client Error 4xx
Definition
the request contains bad syntax or cannot be fulfilled at the server
Term
Server Error 5xx
Definition
The server failed to fulfill an apparently valid request
Term
Global Failure 6xx
Definition
The request cannot be fulfilled at any server
Term
Client Transaction
Definition
sends requests
Term
Server Transaction
Definition
responds to requests with one or more responses
Term
Invite Transaction
Definition
establishes a long-running conversation referred to as a Dialog, and includes ACK of any non-failing final response
Term
Dialog
Definition
a long-running conversation in SIP
Term
SIMPLE
Definition
Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions. It is a SIP-based suite of standards for instant messaging and presence information
Term
MSRP
Definition
Message Session Relay Protocol. Allows instant message sessions and file transfers
Term
TTCN-3
Definition
a test specification language used to specify conformance tests for SIP implementations
Term
SIP-I
Definition
Session Initiation Protocol with encapsulated ISUP
Term
ISUP
Definition
ISDN User Part, a protocol used to create, terminate, and modify communication sessions based on ISUP using SIP and IP networks
Term
CDR
Definition
Call Detail Record
Term
DID
Definition
Direct Inward Dial
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