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2 | MDT Confidential
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
3 | MDT Confidential
Call Flow MappingMedtronic IP & SIP Call Flow
FAX
MS UMServer
Intercall
G.7
29G
.729
Verizon SBC
AnalogGW
Cisco CUBE
79X1
7936
MTP IOS SW
Res
AnalogPhone
AnalogGW
G.7
11 N
ativ
e R
FC
283
3
G.7
11G
.711
G. 7
1 1 N
a tiv
e R
FC
28 3
3
79X1
7936AnalogPhone
AnalogGW
MS UMServer
G.7
29
G.7
29 –
Nat
ive
RF
C 2
833
G.7
29G
.729
79X1
7936
MTP IOS SW
Res
AnalogPhone
AnalogGW
G.7
29 –
Nat
ive
RF
C 2
833
G.7
29 N
ativ
e R
FC
283
3
79X1
7936AnalogPhone
AnalogGW
Verizon SBC Verizon SBC
Verizon Voice PSTN Out Verizon Fax PSTN In Conferencing Out Microsoft Voicemail Out
G.7
29
Off cluster calls sent to Acme
Called DID lookup via local route table. Match call routes on net.
No match routes to VzbNo digit prepend from Verizon
Call routed to cluster based on source SIP trunk or LRT lookup. Codec based on cluster regions
Verizon Fax PSTN Out
G.7
11
No digit prepend from Verizon
Call routed to cluster based on source SIP trunk or LRT lookup.
Faxes split off in specific region to force G.711
G.7 11
FAX
Verizon SBC
AnalogGW
G.7
11G
.711
Route List Prepends 003 to all outbound DIDs for Fax calls
Acme matches strip 003 and adds SDP with G.711 codec only
(HMR converts to EO Invite)
G.7
29
No digits striped
No digits prepended
MTP SW Cluster Res
Verizon SBC
G.7
11
No digits prepended from Verizon
Microsoft Voicemail InVerizon Voice PSTN In
Call covers to UM. New SIP invite created for UM using G.711 based
on Region relationship
ACME SBC ACME SBC ACME SBC ACME SBCACME SBC
G.7
11
G.7
29 N
ativ
e R
FC
283
3
G.7
29 N
ativ
e R
FC
283
3
G.7
29 –
Nat
ive
RF
C 2
833
MTP IOS SW
Res
G.7
29G
.729
4 | MDT Confidential
Lessons Learned (Cont)
• Outbound ANI Considerations (Masking)• Start With Non-Critical Applications • Understand Carrier SIP Requirements
5 | MDT Confidential
Delayed Vs. Early Offer Challenge
Tot
Verizon today only supports SIP Early Offer
Problem:Cisco Early Offer only supports G.711 on version 6.x and earlier. Media Termination Point are also required for every call.
MTP routes media path through Call Manager Cluster or Media Gateway
Cisco IPPhone
Call ManagerCluster
Verizon Session Border Controllers
ACME Session Border Controllers
6 | MDT Confidential
Delayed Vs. Early Offer Solution
Tot
Verizon only supports SIP Early Offer today. Other vendors support varies.
Cluster sends all SIP Invites as Delayed Offer allowing G.729 or G.711 codec negotiation.
Media path flows directly from IP phone to Acme SBC once media is established.
Cisco IPPhone
Call ManagerCluster
Verizon Session Border Controllers
ACME Session Border Controllers
Solution:Acme SBC modifies SIP Invite from Call Manager using Header Manipulation Rule. Acme adds SDP converting it from Delayed to Early Offer.
SDP for voice calls includes G.711 & G.729.codecs. SDP for fax calls includes only G.711.
7 | 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
8 | MDT Confidential
SIP Capacity Management
Tot
PR
Is
PSTN
PSTNIP Gateways
Twin Cities Metro Area Remote SiteRemote Site
Verizon Session Border Controllers
ACME Session Border Controllers
Cisco IPPhone
Cisco IPPhone
Cisco IPPhone
Cisco IPPhone
Cisco IPPhone
Cisco IPPhone
Cisco IPPhone
Cisco IPPhone
Cisco IPPhone
180 total concurrent calls
provisioned
140 concurrent calls provisioned on Twin Cities SIP Trunk
Acme set to only allow 100 calls outbound on Twin Cities trunk
No restrictions set for regional sites
Calls over 100 outbound from Twin Cities overflow to legacy PSTN
Remote sites provisioned with 1 call only. BEST allows burst of 50 over.
Twin Cities site used as overflow protection
9 | MDT Confidential
Questions
