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UM-Voice Systems - Internet2 Voice Over IP Special Interest Group

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					     Internet2.edu Workshop

        IP Telecommunication


          The Promises and the Challenges



Pradip Patel: ppatel@umich.edu
Time Division Multiplexing (TDM )Voice Network
                 Switching fabric
                  System Manager
                  Call Control

                                              Voicemail

                                             Call Center
      PSTN
                     PBX                         IVR

                                                Billing

                                             Provisioning




                    University of Michigan
     TDM Voice System Architecture

n   Centralized Services & Infrastructure
    n   Administration
    n   Call control, Call Processing
    n   Dial Plan
    n   Billing
    n   Voicemail
    n   Call Centers
    n   350+ Call Features
    n   Carrier Termination Point
    n   18Kft loop limit
TDM-Pros
n   Matured technology
n   Standard based analog phone support
n   Meets 95% of user basic voice needs
n   Dedicated voice network
n   Meets regulatory requirements (E911, CALEA)
n   End to End Guaranteed Bandwidth
n   Reasonably Good Security
n   Support model in place
n   Management model well understood
n   Trained Staff
TDM-Cons
n   Large capital investment in new cable plant
n   Costly environmental requirements ??
n   Centralized Redundancy ??
n   Maintain dual Physical Networks (Voice/Data)
n   Long lead time for new feature development
n   High cost for moves, adds and changes
n   Costly to add new lines and applications
n   Proprietary Signaling for enhanced phones
n   High cost for “One of a Kind” features
VOICE OVER INTERNET PROTOCOL




   The Promises and the Challenges
IP Telephony Building Blocks
•Ethernet Switched Network
•IP PBX
•IP Phones
•IP Gateway
•IP Voice Mail/Unified Messaging
•IP Call Center
•IP Conference Server
•Managed UPS
         Campus IP Voice Model (2000-2003)
IPCCAL       CCMAL
                          MGCP                T1/PRI                       PSTN
                                   Gateway


UoneVM       CCMSEB                                                   Billing System
                                              T1/PRI
    Skinny                MGCP
                                   Gateway




                                                       MSL-100
                                                       MSL-100
             CCMDB                                               T1/PRI
                          MGCP                T1/PRI                      Gateway
                                   Gateway
                                                                      H323
    sip.umnet.umich.edu                                           message.umich.edu
                           SIP
                                              T1/PRI
                                  Gateway


                                 IP Network
Off-Campus Voice Extension Model (2000-2003)
Central Location




 IP PBX
                         T-1            T-1
                   Rtr         IP WAN         Rtr
 IP VM
                                                    OFF CAMPUS
  IP CC
                                                    LOCATION A
  IP GW
                     Fiber

   MSL100


                               OFF CAMPUS
                               LOCATION A
  Overcoming Challenges
Phone Power-----Inline power switches (802.3af)
Power Outage----Managed UPS (30-60 minutes)
Power Outlet------Dedicated power circuit
Dial Plan-----------5 digit integrated with MSL-100
Location ID--------Do Not Move the Phone
E-911---------------Static location ID in UM-PS database
TDM Circuit------- Fax and Emergency
  Overcoming Challenges

• BW Consistancy--L2/L3 marking, queuing, Voice Vlan
• Reliability--Redundant Call Servers, HA data Network
• Security ---ACL’s, Private IP, Private Fiber, VPN
   Overcoming Challenges
• Billing--------------------------------MSL-100
• Meet-Me Audio Conference----MSL-100

• Voice Mail----------------------Unified Messaging System
• CALEA-------------------------------MSL-100
• AuthCode----------------------------MSL-100
  Overcoming Challenges
• Features--- Basic feature like CW, 3WC, hold, transfer

• Codec support--------- G711 ulaw, G729A
• Signaling-----------------Proprietary, (SIP RFC 3261)
• Desktop Phones--------Proprietary, (SIP)
• Analog Phones--------- ATA endpoints (SIP, H323)
• Wireless Phones------- 802.11b Phones
 Other Challenges
• Denial of Service Attack
• Eavesdropping
• End to End Encryption (signaling and media)
• Intrusion Detection Systems
• Firewall
• NAT
• Staff Training and Troubleshooting tools
         Campus Data Network Model

                                      Voice
Backbone Core                       Application
                                     servers




Building Edge



Closet


                IT-COMMUNICATIONS
Nortel SIP Trial Production (50 users)

   Private Address        SMDI
                                     Unified Messaging
   KVM Terminal Server

    Application Server

     Database Server                 VEGA SIP Gateway    MSL-100

        Acct/Mgt


     Prov/Web/IPCM
                                       Nortel VPN
    Conference Server

                         CAMPUS IP
                         NETWORK

       SIP Client                     SIP Client
                                  PSTN                    Voice Call Routing Model
                                          T1/PRI

                                               T1/PRI                        SIP
           Cisco MGCP
           Cisco MGCP
                                                                                      UM
 CCM                                                    CISCO SIP Gateway           Network
                        T1/PRI     TDM
Skinny
                                  MSL-100




                                                                     g
                             T1/PRI




                                                                  in
                                                                                    MERIT




                                                               al
                                                            gn
                                                                                    Network




                                                         Si
                                 Vega SIP GW




                                                                        ia
                                                                     ed
                                                                   M
                                  SIP
                                                                                    Chicago
                                   CS5100                                          X Connect
                                    SIP

         SIP                                                                       VoiceEx
                                                                                    SIP
                                                                                   Carrier
                                    SIP
Promises
n Flexible Administrative Boundaries
n Intelligent End Points
n Single Dial Plan for Voice, Video and
  Collaborative Applications
n Standard based Signaling Protocol
n Codec Choices
n End Point Choices
n Call routing and feature control with user
n Reduced raceway requirements
Collaboration with mixed vendor products
Vision                   TDM GATEWAY
                         SBC,MCI, AT&T

 SIP                                         VOICE EXCHANGE
                                              IP L.D. CARRIER




  Residential
   Gateway                                                  IPCDR
                        SOFT SWITCH




                                                         VOICEMAIL




           SKINNY   LOCATION, PROVISIONING
            CCM     DHCP,LDAP, MANAGEMENT        SIP
                           SERVER               CS5100
Can you overcome ?
    n Location     identity requirements
    n Integrated     management
    n Training     for support staff
    n Facilities   and Environmental requirements
    n Centralized     vs. Distributed Management Model
    n Centralized     services (VM, database, L.D. LXC etc)
    n Maintaining     existing Dial Plan
    n New   business application
                                               Applications           VOICE—LAB NETWORK
                 5-1233                                              PA,CC.ACD,AUTH, WEB, APPS, etc
                                        I                                                   NWU
                                   T AP                                             MIT
                                  J
                                                                                                SIP
                                                                      Unistim
    Cluster B
                                         H323v2
                                                        Reg. Srv.
                                             GK
   RTP/UDP




                                                                         SIP Srv.

                                             GW          SIP




                                                                                                       P
                                                                                                      HTT
    Cluster A

             Skinny         PRI-NI-1                                                      SIP

                                                         H3
                                                              23                                            iSCSI
                                                                v2
                                                                                      SMTP
                          MGCP

                                 SL100




                                                                                       IMAP                  MSG
                5-1231
                                                                                                            STORE

                                                                                Unified Messaging
                 Analog
5-1232            GW                        5-1230


                                              IT-COMMUNICATIONS
IT-COMMUNICATIONS

				
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posted:11/20/2013
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