VoIP Provisioning Models. 18th NMRG Meeting Nancy, France Dr. Michael Alexander Skype: michael2

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1 VoIP Provisioning Models 18th NMRG Meeting Nancy, France Dr. Michael Alexander Skype: michael2 VoIP Provisioning Models Slide 1 of 12

2 Contents Facilities-based Carrier VoIP vs. Overlay VoIP Voice Gateway Feature Server OSS EMS Provisioning Models Motivating Unified Provisioning Protocols VoIP Provisioning Models Slide 2 of 12

3 Carrier Access Networks VoIP vs. Overlay VoIP Raison d être for designed VoIP/VON in the access network Facilities-based Carriers with own access network can add value, predictable quality Constant toll quality plus POTS availability presently unattainable without link-layer designs Willingness-to-pay two-part tariff with monthly base fee dependent on constant quality service level Some services such as life-line 911 difficult to attain without linepowered/battery backup facilities VoIP Provisioning Models Slide 3 of 12

4 Carrier Access Networks VoIP vs. Overlay VoIP QoS Designs in access networks vary Channelized vs. fat pipe ATM/Ethernet mixed/mpls (e.g. Ethernet over MPLS over Ethernet) Carrying QoS up to VoIP termination point is challenging over multiple link layers Carrier VoIP management is not simpler than for POTS ports Add Quality Probes, Line Quality/Test integrated in POTS/ISDN Line Cards Wireline POTS OSs well integrated VoIP Provisioning Models Slide 4 of 12

5 Voice Gateway Terminates VoIP and/loop emulation protocol Signalling towards class-5 circuit switch with GR-303/V5.x etc. Trunking gateway for PSTN calls from softswitch May do in-network switching Transcoding CPE - SIP Gateway/CPE control for BLES VoIP Provisioning Models Slide 5 of 12

6 Feature Server Tandem with Softswitch Features such as conf calling for at least in-network calls Present Carrier VoIP Networks offload some features to class-5 switch for better SS7/AIN integration Per subscriber feature provisioning not too difficult, logic of call flow/feature mapping complicated VoIP Provisioning Models Slide 6 of 12

7 OSS Provisioning VoIP with PSTN Gateway typically involves multiple provisioning OSs Operators prefer to keep subscriber line records in same OS as POTS Resulting very complex interactions Inventory Impacts CPE (for carrier-managed CPE and VON), softswitch, trunk lines (all: TDM, Ethernet, SDH/SONET), intermediate ATM switches (not routers), Think voice takes a lot of bandwidth at n million subscriber level VoIP Provisioning Models Slide 7 of 12

8 OSS/EMS Performance Being addressed for VoIP Linkage to CAC in overlay approach has been suggested Prerequisite for eventual move to overlay model Alarms Addressed today for VoIP, approaches in alarm correlation models do not differ much from POTS/data services EMSs for VOIP with PSTN show little commonality No consensus even on line ID index field VoIP Provisioning Models Slide 8 of 12

9 Provisioning Models Choice of models Pure per-subscriber provisioning Template provisioning Preprovisioning Dynamic provisioning Subscriber self-provisioning Pure per-subscriber and the polar dynamic approach not well suited for carrier VoIP Pure pre-subscriber only applicable to fully channelized networks Emerging channelized subscriber line with fat-trunk needs combination of provisioning approaches VoIP Provisioning Models Slide 9 of 12

10 Provisioning Models Combined approach provides operator with good control, gives good turn-up times and Capacity activation on trunks: Ethernet, SDH/SONET Avoid per-subscriber provisioning on IP routers Preprovisioning of MPLS devices Template provisioning of NO per-subscriber attribute provisioning but of line/channel ID (ATM VCLs etc.), related information VoIP Provisioning Models Slide 10 of 12

11 Towards Unified Provisioning Protocols Multi-protocol approach (CLI, SNMP, CORBA, XML cumbersome but in the end not too difficult) Multi-model approach very complex to handle across VoIP networks with PSTN gates NETCONF Draft is a major step forward Due lack of modelling language does not solve all prior problems <draft-romascanu-netconf-datatypes-00.txt> and other frameworks step in the right direction OASIS Service Provisioning Markup Language (SPML) disconnected from service provisioning requirements Danger of following the same path as for CORBA models VoIP Provisioning Models Slide 11 of 12

12 Towards Unified Provisioning Protocols Normative models for VoIP/VON with PSTN networks are needed Service models Capacity activation models Equipment models Underlying commonality in voice data models exists coming from PSTN world Frameworks do make sense, impossibility to model every variation Provide base model, extensions flexibility, modelling guidelines VoIP Provisioning Models Slide 12 of 12

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