Global SIP Dialing Plans 21st APAN Meeting Dennis Baron January - - PowerPoint PPT Presentation

Dennis Baron, January 25, 2006 Page 0

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Global SIP Dialing Plans

21st APAN Meeting Dennis Baron January 25, 2006

Dennis Baron, January 25, 2006 Page 1

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SIP.edu Goals

• SIP Connectivity

Build a large base of SIP-reachable Internet2 users by making existing campus PBX, Centrex, and VoIP systems reachable via SIP

• SIP Addressing

Facilitate the convergence of communications identities by promoting the use of email addresses for voice and multimedia communications

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SIP.edu Means

• Publishing “cookbook” with several alternative

“recipes”

• Obtaining corporate sponsorship and promotional

pricing

– Cisco, Avaya, etc.

• Build community of SIP practitioners

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SIP.edu Architecture (Phase 1)

SIP Proxy DNS SIP-PBX Gateway PBX

INVITE (sip:bob@bigu.edu) INVITE (sip:12345@gw.bigu.edu) DNS SRV query sip.udp.bigu.edu telephoneNumber where mail=”bob” PRI / CAS bigu.edu Campus Directory SIP User Agent Bob's Phone

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DNS

INVITE (sip:bob@bigu.edu) DNS SRV query sip.udp.bigu.edu bigu.edu SIP User Agent

SIP.edu Architecture (Phase 2)

location DB If Bob has registered, ring his SIP phone; Else, call his extension through the PBX. REGISTER (Contact: 207.75.164.131) INVITE (sip:bob@207.75.164.131)

SIP Proxy SIP Registrar

Bob's SIP Phone

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Why Phone NUMBERS?

• Users should not be burdened with device addresses, when it’s

people they really care about

• Addresses should be mnemonic and empower enterprises to

manage the identities of their users sip:dbaron@mit.edu

• It’s time to put E.164 phone

numbers behind us!

• A.G. Bell did not say:

“+1-617-252-1232, come

• here. I need you!”

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SIP.edu Components

• DNS Server

– Add SIP SRV records to existing servers

• SIP Proxy Server

– Also acts as SIP registrar – Can support “aliases” for legacy phone numbers – Mimics campus dial plan

• LDAP Server (or other source of directory data)

– Has mapping of email to phone number

• SIP Gateway

– Connects to existing PBX or Centrex – Could also connect to proprietary VoIP system

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SIP.edu Call Flow Example

• SIP DNS lookup for MIT.EDU points to SIP proxy

– Sends INVITE to dbaron@MIT.EDU to proxy

• SIP proxy checks MIT directory

– Maps call to PBX extension – eg. 21232@mit.edu

• SIP proxy checks dial plan

– Routes call to PBX gateway

• PBX rings phone

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SIP.edu “gaps”

• SIP is more than voice

– Video and IM are important too – Presence services change the user experience

• Chickens without eggs only gets you half way

– We’ve made everybody SIP reachable, now who’s going to call them?

• The 12-digit keypad problem will be with us for

awhile

– What do we do until the devices have a 21st century user interface?

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Implementation Status

Your school here!

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Examples – All-in-One

• Asterisk as both proxy and gateway
• Soekris 4801 server with Sangoma

T1/E1 card – Approximately $675USD

• Astlinux (Asterisk + micro Linux)
• Directory lookup via file or LDAP

Still under development and testing

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Examples – Vendor Solution

• Avaya

– SIP Converged Communications Server (CCS) – Communications Manager Media Server and Gateway

• Handle Based Dialing service (LDAP plugin)

SIP N' Go Starter Kit

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Examples – MIT.EDU

Internet External Proxy External Proxy Screening Incoming AuthN Outgoing Signing Internal Proxy Internal Proxy Routing/Dial Plan AuthZ Accounting Personal Proxy Personal Proxy Personal Proxy

…

Registration AuthN Personal Options Gateways

…

Services Services Vmail to Email Conferencing etc. Gateways

Personalization Services

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Examples – MIT.EDU (cont.)

• Web management tool

– Built on Oracle, Apache and X509 certificate authentication

• Account creation/management

– Multiple account owners – SIP and voice mail password changing – Billing account – View aliases and DID numbers – Current SIP registrations

• Contact information
• Registration and expiration times
• User agent information

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Examples – MIT.EDU (cont.)

• Routing and call handling options

– Forward to another SIP address or to PSTN – Activate voice mail – Set ringing time before voice mail – Suppress PSTN caller-ID – Black lists to voice mail – Anonymous call blocking

• Voice mail options

– Forward to email – Email attachment – WAV, MP3, GSM – Store messages on server – Enable Message Waiting Indication (MWI)

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SIP.edu

– Web page: http://www.internet2.edu/sip.edu/ – Mailing list: mailto:sip.edu@internet2.edu – Conference calls: Thursdays – 2:00 – 3:00pm Eastern US

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SIP.edu – More Information?

Contact: Dennis Baron, MIT mailto:dbaron@MIT.EDU sip:dbaron@MIT.EDU

• r, if you must!

tel:+1-617-252-1232 isn:21232*270

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