Global SIP Dialing Plans

Transcription

1 Global SIP Dialing Plans 21st APAN Meeting Dennis Baron January 25, 2006 Page 0

2 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 addresses for voice and multimedia communications Page 1

3 SIP.edu Means Publishing cookbook with several alternative recipes Obtaining corporate sponsorship and promotional pricing Cisco, Avaya, etc. Build community of SIP practitioners Page 2

4 SIP.edu Architecture (Phase 1) SIP User Agent DNS SRV query sip.udp.bigu.edu INVITE DNS SIP Proxy INVITE SIP-PBX Gateway PRI / CAS PBX bigu.edu telephonenumber where mail= bob Campus Directory Bob's Phone Page 3

5 SIP.edu Architecture (Phase 2) SIP User Agent DNS DNS SRV query sip.udp.bigu.edu SIP Proxy INVITE If Bob has registered, ring his SIP phone; Else, call his extension through the PBX. INVITE bigu.edu location DB SIP Registrar REGISTER (Contact: ) Bob's SIP Phone Page 4

6 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: , come here. I need you! Page 5

7 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 to phone number SIP Gateway Connects to existing PBX or Centrex Could also connect to proprietary VoIP system Page 6

8 SIP.edu Call Flow Example SIP DNS lookup for MIT.EDU points to SIP proxy Sends INVITE to to proxy SIP proxy checks MIT directory Maps call to PBX extension eg. SIP proxy checks dial plan Routes call to PBX gateway PBX rings phone Page 7

9 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 21 st century user interface? Page 8

10 Implementation Status Your school here! Page 9

11 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 Page 10

12 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 Page 11

13 Examples MIT.EDU Screening Incoming AuthN Outgoing Signing External Proxy External Proxy Internet Gateways Routing/Dial Plan AuthZ Accounting Internal Proxy Internal Proxy Gateways Services Services Vmail to Conferencing etc. Registration AuthN Personal Options Personal Proxy Personal Proxy Personal Proxy Services Personalization Page 12

14 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 Page 13

15 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 attachment WAV, MP3, GSM Store messages on server Enable Message Waiting Indication (MWI) Page 14

16 SIP.edu Web page: Mailing list: Conference calls: Thursdays 2:00 3:00pm Eastern US Page 15

17 SIP.edu More Information? Contact: Dennis Baron, MIT or, if you must! tel: isn:21232*270 Page 16

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