Nortel CS1000 Branch Office Solutions

1
Nortel CS1000Branch Office Solutions

• Asko Hotakainen
• Senior Sales Engineer

2
Agenda

• Introduction
• Call Server and Media Gateways
• High Availability
• N-Way Geographic Redundancy (MG1000E)
• Branch Office (MG1000B)
• IP Phones
• Building Resilient Networks to support CS1000

3
Introduction

• The goal of building a resilient CS1000 branch
  office solution is to minimize downtime and
  impact of software and hardware failures to the
  end-user
• Resiliency comes with a price - in many cases
  possibly requiring extra / duplication of
  hardware
• Be aware of how applications (e.g. CallPilot,
  CCMS, MLS, ICD, ICB etc.) can be connected and
  integrated
• Remember that the CS1000 is inherently reliable

4
Branch Office considerations

• What are the needs at the branch office
• Which kind of extensions?
• Analog, digital, IP, local mobility (DECT,
  WLAN..)
• Is there an need to host applications?
• Contact Center, IVR, etc
• Local PSTN breakout?
• To help traffic engineering, numberingplan issues
  and survivability
• The answers to these questions will mainly
  dictate the solution.

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What are the Options for a remote site

• Call Server (traditional PBX networking)
• MG1000E
• No survivability
• SMG1000E
• Survivable
• limited application support
• MG1000B
• Survivable
• SW compatibility with core, limited configuration
  integration, limited scalability max 400 users
• SRG
• Survivable (up to 80 IP users)
• no configuration integration

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PBX Networking
Site 2
Site 1
Call Server
Call Server
SS
SS
MG
MG
PSTN
PSTN
QOS IP Network
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Core site(s) with High Availability
Secondary Data Center
Synchronization and Graceful switchover
Primary Data Center
Call Server Active Core
Call Server Inactive Core
Layer 2 Connection
Same ELAN Subnet Could be via VLAN through
routers that support this.
SS
SS
MG
MG
PSTN
PSTN
QOS IP Network
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Branch Solution Options
Secondary Data Center
Synchronization and Graceful switchover
Primary Data Center
Call Server Active Core
Call Server Inactive Core
Layer 2 Connection
Same ELAN Subnet Could be via VLAN through
routers that support this.
SS
SS
MG
MG
PSTN
QOS IP Network
PSTN
Branch 3
Branch 1
Branch 2
MG
SS
PSTN
IP Sets
PSTN
SS Signaling Server MG Media Gateway
TDM Sets
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MG1000E with Survivable Media Gateways

• N-Way Replication system provides up to 2 levels
  of geographic redundancy
• Primary CS failure - each configured Alternate CS
  1 provides service to all the resources in its
  responsibility (to the equipment on which it is
  configured as second choice)
• WAN failure - each configured Alternate CS 2
  provides service only to the resources in its own
  area (to the equipment on which it is configured
  as third choice)
• Primary Call Server can replicate its database to
  50 Call Servers (Can be PIV Call Server pair or
  CPPM CS (SA or HA))
• No need to manage Branch systems
• Configured centrally, with automatic database
  replication
• Automatic failover and failback of Survivable
  Media Gateways
• Redundancy provided applies to both IP TDM
  resources
• Potentially support ALL IP and TDM users in
  Survivable Mode

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MG1000B

• Standalone traditional Branch offering for up
  to 400 IP phones
• Supports TDM sets and Trunks as well as some
  applications also (see Compatibility NTP for more
  details)
• Consists of 1 Media Gateway (Chassis or Cabinet)
  plus 1 Media Gateway Expander (Chassis)
• License limit to operate in Survivable Mode for
  90 Days
• TM3.1 can manage Moves, Adds and Changes for
  Branch IP users from Main Site

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SMG1000E versus MG1000B
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Geographic Redundancy Positioning Recommendations

• Where possible, we position GR Survivable
  Media Gateway for customers who want a
  survivable system and/or survivable gateways,
  i.e. Branch office customers
• We assume this solution will be most popular with
  our branch customers due to new enhancements,
  i.e. database synchronization, no duplicate
  configuration, both TDM IP survivability, Local
  Music/RAN, etc.
• Position GR Survivable Media Gateway if
• Customer does not require more than 50 Survivable
  Gateways per Main office
• Customer meets WAN RTD packet loss requirements

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GR Positioning Recommendations Continued

• In cases where GR- Survivable Media Gateway is
  not appropriate, we position either GR-
  Controlled Load sharing or MG 1000B solution
• If customers want a branch office solution with
  400 IP users or less and within 8 card slots, and
  the limitations above preclude GR Survivable
  Media Gateway, position MG 1000B.
• For smaller branch offices below 50 users, we
  position SRG
• We position GR Controlled Load sharing if
• Customer wants full IP Peer systems backing each
  other up
• Customer wants back-up systems to be flexible
• Mixture of Temporary IP users and Permanent IP or
  TDM users.
• Different database/configuration allowed on
  back-up systems
• Customer is only interested in IP survivability
• Customer views the limitations with GR
  Survivable Media Gateway in previous slide
  unacceptable.
• Customer wants large branch office in excess of
  400 IP users, or with more than 8 card slots, and
  limitations with GR Survivable Media Gateway
  are unacceptable.

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MG 1000B Resiliency

• H.323/SIP WAN Gateway in remote branch offices,
  enables local PSTN access
• Users configured, and managed centrally from Main
  site
• Survivable in the event of a WAN failure

Main Site Large Campus Site
Branch Office
Rest of World
MG 1000B
Campus Media Gateways
Call Server
Survivability Sets Register to local gateway in
the case of a WAN failure
Normally Sets Configured and Managed from Main
Site
NRS
MG1000B Call Server Does not need to reboot to
take control of IP phones in local Mode IP
phones rehome and hence fallback is faster!
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Geographic Redundancy Survivable Media Gateways
Secondary Data Center
Redundant Call Processor
Primary Data Center
Synchronization and Graceful switchover
Alternate Call Processor
PSTN
QOS IP Network
PSTN
Database Replication
Branch 3
SS
Branch 1
SS
Branch 2
Survivable MG Includes Alternate Call Server
Branch Office
IP Sets
PSTN
Survivable MG (no Call Server)
TDM Sets
PSTN
PSTN
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Geographic Redundancy Survivable Media Gateways
Secondary Data Center
Redundant Call Processor
Primary Data Center
Synchronization and Graceful switchover
Alternate Call Processor
Primary Failure Media Gateways register to an
alternate processor
PSTN
QOS IP Network
PSTN
Branch 3
SS
Branch 1
Branch 2
Survivable MG Includes Alternate Call Server
PSTN
IP Sets
Survivable MG (no Call Server)
MG
SS Signaling Server MG Media Gateway
PSTN
TDM Sets
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Geographic Redundancy Survivable Media Gateways
Secondary Data Center
Redundant Call Processor
Primary Data Center
Synchronization and Graceful switchover
Alternate Call Processor
IP Network Failure Media Gateways register to a
local processor
PSTN
QOS IP Network
PSTN
Branch 3
SS
Branch 1
Branch 2
Survivable MG Includes Alternate Call Server
PSTN
IP Sets
Survivable MG (no Call Server)
SS Signaling Server MG Media Gateway
PSTN
TDM Sets
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Network Resiliency

• Survivability at the branch Sites for telephony
  is in many cases based on decisions made from a
  telephony perspective (quite natural !)
• Local PSTN access to use if service is lost from
  Main site.
• Survivability can also be based on IP network and
  resilient core (High Availability) by using
  redundant network links, possibly with a lower
  capacity on the backup link.

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Redundancy for the remote sites WAN
CORE SITE
Datacenter 1
Datacenter 2
MG1000E
MG1000E
Call Server CPU0
Call Server CPU1
MG1000E
WAN
MG1000E
MG1000E
MG1000E
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Frågor ?