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VoIP concepts

时间:2017-03-03 14:09:45      阅读:232      评论:0      收藏:0      [点我收藏+]

标签:voip server   pbx

  • Traditional telephone system:

PSTN public switch telephone network

Central office:

NADP: North America Dialing Plan – routing protocol

Demarc box:  outside demark box charged by telephonecompany;   inside demark box is chargedby yourself. 

                                                                                                                                   

Trunk Lines: every single line has its ownphone number.  One trunk line only allowone call in or one call out.

Hunt group: incoming calls -- have mainnumber. If one trunk line is busy then forward to the other trunk line in thegroup.  Handled by central office.

outgoing calls:  – controlled by PBX -- can program thetelephone system outgoing call on your PBX.

 

The phone system:

PBX: the server that route all the calls.

Voicemail: usually separate with PBXserver.  Run all the voice stuff.

AA: Auto Attendance.  The option is programed in PBX, but the voiceis located on Voice mail box sitting on the voice system.

 

Stations:

Digital/analog,  digital PBX + digital station.   Analog PBX – Analog station.    Digital PBX have a couple of analog ports.

 

Subscribers:

Voice mail – don’t have to have a physicaltelephone,  can route directly to theirmailbox. 

Ports: the ports you buy determine how manypeople you can voice mail them in one time.

 

  • VoIP telephone system:

VoIP servers:  (IP IPBX) – can rent or purchase.

         Createextension with userID&passwd

 

IP trunk line:  over Ethernet.  VS normal trunk line.

 

VoIP client:  can use the userID&passwd to register onthe VoIP server. 

hard phone ---computers looks like phones ,  can accessvia web browser. 

soft phone

 

VoIP gateways:

          Send IP phone signal to normal phoneline. 

          Connect different communicationinfrastructure.  Allow skype switch toSIP or normal phone line. 

 

VoIP protocols:

         SIP:  session initiated protocol.   Cisco/Polycom sip phone. 

         Privateprotocol

 

VoIP codecs

         4.5kbps.at least per user. 

 

Network latency and QoS

         Latency:75ms.   <100ms. 

         Traditionlatecy: 45ms. 

 

Unified communication: combine into youroutlook,  switch to voice and txtfile. 

           

Voip server,   remote location site’s ip phones canregister to this ip-pbx server remotely!

 技术分享


VoIP concepts

标签:voip server   pbx

原文地址:http://41080138.blog.51cto.com/2587513/1902828

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