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SIP Trunking Implementation




Jim Allen
Global Unified Communications Architect
James.R.Allen@Medtronic.com
Lessons Learned
• Address Network Readiness
• Understand Pricing Models
   – Savings Vary Based on Site Dynamics (for us; Favors
     Sites Under 100 Users)
• Get Comfortable with Risk (Savings Based on
  Elimination of Local PRIs)
• Map ALL Call Flows




                                             2 | MDT Confidential
Call Flow Mapping
Medtronic IP & SIP Call Flow
Verizon Voice PSTN Out                                                Verizon Voice PSTN In                                                Verizon Fax PSTN In                     Verizon Fax PSTN Out              Conferencing Out                                                              Microsoft Voicemail Out                                            Microsoft Voicemail In




                      Verizon SBC                                                            Verizon SBC                                         Verizon SBC                            Verizon SBC                                                    Intercall                                                                                                            Verizon SBC

                                                                                                                                                                                                                                                                                                                                 MS UM
                                                                                                                                                                                                                                                                                                                                 Server




                                                                                                                                                                                                                                                                                                                                                                                       G.711
                                                                                                                                                                                                  G.711




                                                                                                                                                                                                                                                             G.729
                                    G.729




                                                                                                         G.729




                                                                                                                                                           G.711
                                                                                                                                                                                     Acme matches strip 003 and
 Called DID lookup via local route
                                                                                                                                                                                   adds SDP with G.711 codec only                                    No digits striped                                                                                                No digits prepended from Verizon
 table. Match call routes on net.                                       No digit prepend from Verizon                                        No digit prepend from Verizon
      No match routes to Vzb                                                                                                                                                         (HMR converts to EO Invite)




                                                                                                                                                                                                                                                                                                                                  G.711
                                                                                                                                                                                                                                                                                                                                                                               ACME SBC
                               ACME SBC                                                             ACME SBC                                         ACME SBC                              ACME SBC
                                                                                                                                                                                                                                                      Cisco CUBE




                                                                                                                                                                                                                                                                                                                                              G.711 Native RFC 2833
                                                                                                                                             Call routed to cluster based on
                                                                                                                                                                                    Route List Prepends 003 to all
                                                                        Call routed to cluster based on                                     source SIP trunk or LRT lookup.                                                                                                                                                                                           Call covers to UM. New SIP invite
  Off cluster calls sent to Acme                                                                                                                                                     outbound DIDs for Fax calls                                    No digits prepended
                                                                       source SIP trunk or LRT lookup.                                     Faxes split off in specific region to                                                                                                                                                                                      created for UM using G.711 based




                                                                                                                                                                                                                                                                                                      G.711 Native RFC 2833
                                                                       Codec based on cluster regions                                                  force G.711                                                                                                                                                                                                          on Region relationship




                                                                                                                                                                                                                                                           G.729
                                  G.729




                                                                                                        G.729




                                                                                                                                                                                                                                                                           G.729 Native RFC 2833
                                              G.729 Native RFC 2833




                                                                                                                   G.729 Native RFC 2833




                                                                                                                                                                                                                          G.729 – Native RFC 2833
     G.729 – Native RFC 2833




                                                                          G.729 – Native RFC 2833




                                                                                                                                                                                                  G.711
                                                                                                                                                            G.711




                                  MTP
                                                                                                        MTP                                                                                                                                                MTP
                                IOS SW                                                                                                                                                                                                                                                                                         MTP SW




                                                                                                                                                                                                                                                                                                                                                                                     G.711
                                                                                                      IOS SW                                                                                                                                             IOS SW
                                  Res                                                                                                                                                                                                                                                                                         Cluster Res
                                                                                                        Res                                                                                                                                                Res
                                   G.729




                                                                                                                                                                                                                                                                                                                                   G.711
                                                                                                        G.729




                                                                                                                                                                                                                                                            G.729
                                                                                                                 Analog                                  Analog                                Analog                                                                Analog                                                                 Analog
                                            Analog
                                                                                                                  GW                                      GW                                    GW                                                                    GW                                                                     GW
                                             GW




    79X1                         7936                                    79X1                          7936                                               FAX                                   FAX                      79X1                             7936                                       79X1                        7936                                             MS UM
                                            Analog                                                               Analog                                                                                                                                                  Analog                                                             Analog                                Server
                                            Phone                                                                Phone                                                                                                                                                   Phone                                                              Phone



                                                                                                                                                                                                                                                                                    3 | MDT Confidential
Lessons Learned (Cont)
• Outbound ANI Considerations (Masking)
• Start With Non-Critical Applications
• Understand Carrier SIP Requirements




                                    4 | MDT Confidential
Delayed Vs. Early Offer Challenge
            Verizon today only supports
            SIP Early Offer
                                                                 Verizon Session Border
                                                                       Controllers




                                                 ACME Session Border
                                                     Controllers
                                          Tot




                                                                                      Problem:
                                                                                      Cisco Early Offer only supports
                                                                                      G.711 on version 6.x and earlier.
                                                                                      Media Termination Point are also
                                                                                      required for every call.
                                                Call Manager
                                                  Cluster




                                                               MTP routes media
 Cisco IP                                                      path through Call
  Phone                                                        Manager Cluster or
                                                               Media Gateway



                                                                              5 | MDT Confidential
Delayed Vs. Early Offer Solution
                    Verizon only supports
                    SIP Early Offer today.
                    Other vendors support                                 Verizon Session Border
                    varies.                                                     Controllers




Solution:
Acme SBC modifies SIP Invite from Call Manager
using Header Manipulation Rule. Acme adds SDP
converting it from Delayed to Early Offer.
                                                            ACME Session Border
SDP for voice calls includes G.711 & G.729.codecs.              Controllers
SDP for fax calls includes only G.711.               Tot




                                                                                                   Cluster sends all SIP Invites
                                                                                                   as Delayed Offer allowing
                                                                                                   G.729 or G.711 codec
                                                                                                   negotiation.
                                                           Call Manager
                                                             Cluster




                                                                    Media path flows directly from IP
                                                                    phone to Acme SBC once media is
             Cisco IP
              Phone                                                 established.




                                                                                       6 | MDT Confidential
Lessons Learned (Cont)
• Pilot and Test Extensively
   – Test ALL Variations
      • Local, National, International, Small Markets, Faxing
      • Voice mail & UM, Auto Attendants etc
• Route Outbound First
• Port DIDs Last – Most Difficult to Back Out
• Define Capacity Strategy




                                                   7 | MDT Confidential
SIP Capacity Management
                                                                                                                        180 total
                                                                                                                     concurrent calls
      PSTN                                                         Verizon Session Border                              provisioned
                                                                         Controllers




                              Calls over 100 outbound from Twin
                              Cities overflow to legacy PSTN


          Acme set to only allow 100 calls                                                                 No restrictions set for
   PRIs




          outbound on Twin Cities trunk
                                                                                                           regional sites
                                                                  ACME Session Border
                                                                          Tot


                                                                      Controllers
          140 concurrent calls provisioned on
          Twin Cities SIP Trunk



                                                                                                                        Remote sites provisioned with 1
                           Twin Cities site used as
                                                                                                                        call only. BEST allows burst of
                           overflow protection
      PSTN                                                                                                              50 over.
  IP Gateways




                Cisco IP          Cisco IP     Cisco IP                   Cisco IP   Cisco IP   Cisco IP                Cisco IP   Cisco IP   Cisco IP
                 Phone             Phone        Phone                      Phone      Phone      Phone                   Phone      Phone      Phone



Twin Cities Metro Area                                                                           Remote Site                                      Remote Site


                                                                                                           8 | MDT Confidential
Questions




            9 | MDT Confidential

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SIP Trunking Case Study (Medtronic) Part 2

  • 1. SIP Trunking Implementation Jim Allen Global Unified Communications Architect James.R.Allen@Medtronic.com
  • 2. Lessons Learned • Address Network Readiness • Understand Pricing Models – Savings Vary Based on Site Dynamics (for us; Favors Sites Under 100 Users) • Get Comfortable with Risk (Savings Based on Elimination of Local PRIs) • Map ALL Call Flows 2 | MDT Confidential
  • 3. Call Flow Mapping Medtronic IP & SIP Call Flow Verizon Voice PSTN Out Verizon Voice PSTN In Verizon Fax PSTN In Verizon Fax PSTN Out Conferencing Out Microsoft Voicemail Out Microsoft Voicemail In Verizon SBC Verizon SBC Verizon SBC Verizon SBC Intercall Verizon SBC MS UM Server G.711 G.711 G.729 G.729 G.729 G.711 Acme matches strip 003 and Called DID lookup via local route adds SDP with G.711 codec only No digits striped No digits prepended from Verizon table. Match call routes on net. No digit prepend from Verizon No digit prepend from Verizon No match routes to Vzb (HMR converts to EO Invite) G.711 ACME SBC ACME SBC ACME SBC ACME SBC ACME SBC Cisco CUBE G.711 Native RFC 2833 Call routed to cluster based on Route List Prepends 003 to all Call routed to cluster based on source SIP trunk or LRT lookup. Call covers to UM. New SIP invite Off cluster calls sent to Acme outbound DIDs for Fax calls No digits prepended source SIP trunk or LRT lookup. Faxes split off in specific region to created for UM using G.711 based G.711 Native RFC 2833 Codec based on cluster regions force G.711 on Region relationship G.729 G.729 G.729 G.729 Native RFC 2833 G.729 Native RFC 2833 G.729 Native RFC 2833 G.729 – Native RFC 2833 G.729 – Native RFC 2833 G.729 – Native RFC 2833 G.711 G.711 MTP MTP MTP IOS SW MTP SW G.711 IOS SW IOS SW Res Cluster Res Res Res G.729 G.711 G.729 G.729 Analog Analog Analog Analog Analog Analog GW GW GW GW GW GW 79X1 7936 79X1 7936 FAX FAX 79X1 7936 79X1 7936 MS UM Analog Analog Analog Analog Server Phone Phone Phone Phone 3 | MDT Confidential
  • 4. Lessons Learned (Cont) • Outbound ANI Considerations (Masking) • Start With Non-Critical Applications • Understand Carrier SIP Requirements 4 | MDT Confidential
  • 5. Delayed Vs. Early Offer Challenge Verizon today only supports SIP Early Offer Verizon Session Border Controllers ACME Session Border Controllers Tot Problem: Cisco Early Offer only supports G.711 on version 6.x and earlier. Media Termination Point are also required for every call. Call Manager Cluster MTP routes media Cisco IP path through Call Phone Manager Cluster or Media Gateway 5 | MDT Confidential
  • 6. Delayed Vs. Early Offer Solution Verizon only supports SIP Early Offer today. Other vendors support Verizon Session Border varies. Controllers Solution: Acme SBC modifies SIP Invite from Call Manager using Header Manipulation Rule. Acme adds SDP converting it from Delayed to Early Offer. ACME Session Border SDP for voice calls includes G.711 & G.729.codecs. Controllers SDP for fax calls includes only G.711. Tot Cluster sends all SIP Invites as Delayed Offer allowing G.729 or G.711 codec negotiation. Call Manager Cluster Media path flows directly from IP phone to Acme SBC once media is Cisco IP Phone established. 6 | MDT Confidential
  • 7. Lessons Learned (Cont) • Pilot and Test Extensively – Test ALL Variations • Local, National, International, Small Markets, Faxing • Voice mail & UM, Auto Attendants etc • Route Outbound First • Port DIDs Last – Most Difficult to Back Out • Define Capacity Strategy 7 | MDT Confidential
  • 8. SIP Capacity Management 180 total concurrent calls PSTN Verizon Session Border provisioned Controllers Calls over 100 outbound from Twin Cities overflow to legacy PSTN Acme set to only allow 100 calls No restrictions set for PRIs outbound on Twin Cities trunk regional sites ACME Session Border Tot Controllers 140 concurrent calls provisioned on Twin Cities SIP Trunk Remote sites provisioned with 1 Twin Cities site used as call only. BEST allows burst of overflow protection PSTN 50 over. IP Gateways Cisco IP Cisco IP Cisco IP Cisco IP Cisco IP Cisco IP Cisco IP Cisco IP Cisco IP Phone Phone Phone Phone Phone Phone Phone Phone Phone Twin Cities Metro Area Remote Site Remote Site 8 | MDT Confidential
  • 9. Questions 9 | MDT Confidential