SIP.edu Project TERENA VoIP Workshop

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1 SIP.edu Project TERENA VoIP Workshop Dennis Baron June 5, 2005 Page 1

2 SIP.edu Goals Grow SIP connectivity on the Internet Increase value proposition for end-user SIP adoption Promote converged identity - -style addressing Provide a useful service; while supporting enhanced campus services and experiments Means Publishing cookbook with several alternative recipes Obtaining corporate sponsorship and promotional pricing Cisco, Avaya, Pulver.com so far Build community of SIP practitioners Page 2

3 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 It s time to put E.164 phone numbers behind us! A.G. Bell did not say: , come here. I need you! Page 3

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

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. INVITE bigu.edu location DB SIP Registrar REGISTER (Contact: ) Bob's SIP Phone Page 5

6 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 Connects to existing or Centrex Could also connect to proprietary VoIP system Page 6

7 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 extension eg. SIP proxy checks dial plan Routes call to gateway rings phone Page 7

8 SIP.edu Configuration SIP Server Internet2 Network SIP user wants to call DNS Server SIP/PRI LDAP Server PSTN Page 8

9 DNS SRV Lookup DNS SRV Internet2 SIP Server Network DNS lookup for MIT.EDU DNS Server SIP/PRI LDAP Server PSTN Page 9

10 SIP INVITE Internet2 SIP SIP Server Network SIP INVITE to DNS Server SIP/PRI LDAP Server PSTN Page 10

11 LDAP Lookup Internet2 SIP Server LDAP Network LDAP lookup for dbaron returns x21232 DNS Server SIP/PRI LDAP Server PSTN Page 11

12 Call Sent to SIP Server Internet2 Network SIP INVITE to x21232 via DNS Server SIP SIP/PRI LDAP Server PSTN Page 12

13 Media Stream via to Internet2 RTP SIP Server Network SIP user talks to at x21232 DNS Server SIP/PRI LDAP Server PSTN Page 13

14 Sip to SIP Calling Internet2 RTP SIP Server Network SIP user talks to at his SIP phone DNS Server SIP/PRI LDAP Server PSTN Page 14

15 SIP to and PSTN Calling SIP Server Internet2 Network SIP user calls or DNS Server SIP/PRI LDAP Server PSTN Page 15

16 and PSTN to SIP Calling SIP Server Internet2 DNS Server LDAP Server Network SIP/PRI PSTN user calls or user calls PSTN Page 16

17 SIP.edu Reachable Users Page 17

18 SIP.edu Quotes This project was initiated by the need to provide reliable, IP based phones for the Toolik Lake research station located north of the Brooks Range. University of Alaska Fairbanks sipeth: Internet Telefonie for the ETH Zurich: This project has been inspired by the Internet2 SIP.edu initiative. During the exploration process many new ideas have led to a new vision for our project. ETH Zurich Our SIP.edu infrastructure has allowed us to utilizing our Internet2 connections to reestablish the telephone tie lines connecting out two institutions. MIT and WHOI Page 18

19 SIP.edu Just do it! Questions? Page 19

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