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Matrix
166
SETU VFX88L
/
VFX44L V1
System Manual
VoIP Basics
VoIP is the sending of voice signal over Internet Protocol. Calling on
VoIP allows user to make phone calls and send faxes over the internet
at a negligible cost compared to the normal circuit switched Telephone
network. The main components of VoIP are:
• SIP
• Network Servers
• RTP
• NAT
• STUN
• Outbound Proxy
• Important Voice Parameters: Jitter Buffer, Voice Compression and
QoS.
SIP:
• The signaling protocol which is used to establish an IP call is called
SIP-Session Initiation Protocol. It is an application layer protocol
that handles the setting up, altering and tearing down of voice and
multimedia sessions over the internet. Refer RFC 3261 for more
information.
• SIP handles telephone calls and can interfere with PSTN network.
• A SIP account uses complete identity called, URI (Uniform
Resource Identifier) or SIP Address, like e-mail address and is
given by: SIP-Number@SIP service Domain.
• SIP number can use letters or numbers like vrajeshp@ITSP
Provider.com or 73121@ITSP Provider.com. A SIP service domain
is the domain name in the SIP URL. For example, if SIP address
is 73121@VoIP Provider.com, then ‘VoIP Provider.com’ is the SIP
service domain.
• In general, SIP follows the Client-Server Architecture. To support
this, there are two main entities-user agent and network servers.
The peers in a session are called User Agents (UAS). A user agent
can function in one of the following roles:
• User agent client (UAC)-A client application that initiates the SIP
request.
• User agent server (UAS)-A server application that contacts the
user when a SIP request is received and that returns a response
subject to user’s input.
Содержание SETU VFX44L
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