VoIP ????

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VoIP ????

• ????
• ???
• http//www.gentrice.net
• sip//sip.gentrice.net
• tel//886-2-22260665

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Topic

• ?????????
• ??????
• ??????
• ??????
• ??????
• ?SBC?voip????

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Data network

• LAN
• WAN
• WAN is not just a big LAN
• Addressing
• Routing

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Voice Network

• PBX
• PSTN
• PSTN is not a collection of PBX
• Numbering

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VoIP standard

• H.323
• first industry standard
• A set of protocol
• SIP
• Client-server, www style
• H.248
• not in the scope of this presentation

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H.323

• LAN like architecture
• Addressing Dial number

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SIP

• Internet architecture
• Address Email like syntax

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????

• trusted
• Ex campus digital library
• adv security
• non-trusted
• Ex E-mail
• adv convenience

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SIP port allocation

• SIP server port 5060 (destination)
• client port could be any (source)
• RTP
• could be any,
• one call use one UDP port

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??????
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case study MOE
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Numbering plan

• 9xx-xxxxx
• ??????,??????????
• ????
• ???070????(?070?)
• ?????????

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??????
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ENUM

• 9xx-xxxxx ????
• enum ??
• ??PSTN????mapping
• ??????
• ?????????? (some solutions available)

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Enum protocol

• RFC 3761
• RFC 2916
• use DNS system to translate E.164 number into IP
  address
• Like SIP, H.323, Email...

ORIGIN 8.4.3.0.6.9.4.6.1.1.4.4.e164.arpa.
NAPTR 10 100 "u" "E2Usip" "!.!sipinfo_at_example
.com!" . NAPTR 10 101 "u" "E2Uh323"
"!.!h323info_at_example.com!" . NAPTR 10
102 "u" "E2Umsg" "!.!mailtoinfo_at_example.com!"
.
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??????
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????

• ???
• IP-PHONE??,??pstn??
• ???
• GW??,??????
• ???
• BOT??

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??????

• 070??
• ????
• ??????
• 9xx??

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????
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????

• F/W
• Routing
• Load balance device (2WAN)

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proxy server

• Up-link to MoE
• Register/account management
• Routing / Special call routing
• CDR
• Number mapping
• Media
• force relay vs P2P

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??voip
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??voip

• ??????
• Traditional PBX for ???
• VoIP for traveler
• VoIP for remote campus
• VoIP for students

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???????

• Gateway solution
• T1/E1 ISDN line
• Analog line
• Issue Available port?

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VoIP Gateway

• ????,????,?????
• ????
• FXO ??????
• ????

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Internet user

• Web call solution
• SIP Softphone
• Security issue
• Via header

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Dial plan

• PBX is a path connect to PSTN
• Internet user should limit the access level

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Application ???
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Web call example
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Example 2
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Example 3--skype
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Ex 4--Web meeting
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Important parts

• Protocol conversion
• Numbering plan
• DTMF issue
• In-band
• Out-band
• Back-end integration

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Codec

• G.711, G.729, G.723
• G.722
• iLBC
• Transcoding

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SessionBorderController
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??

• For access
• ?????
• For peering
• ????sip domain

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???

• ??
• ????
• ????????
• ????
• ??
• RFC ????

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