Nortel CS1000 Branch Office Solutions

Nortel CS1000Branch Office Solutions

Asko Hotakainen

Senior Sales Engineer

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

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

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.

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

Call ServerCall Server

QOS IP Network


MGMG

Site 1Site 2

PSTNPSTN

MGMG

SSSS SSSS

PBX Networking

Call Server Active CoreCall Server Active Core

QOS IP Network

Call Server Inactive CoreCall Server Inactive Core

Layer 2 ConnectionLayer 2 Connection

Same ELAN Subnet Same ELAN Subnet Could be via VLAN through Could be via VLAN through routers that support this.routers that support this.

Synchronization and Graceful Synchronization and Graceful switchoverswitchover

MGMG

Primary Data Center

Secondary Data Center

PSTNPSTN

MGMG

SSSS SSSS

Core site(s) with High Availability

Call Server Active CoreCall Server Active Core

QOS IP Network

Call Server Inactive CoreCall Server Inactive Core

Layer 2 ConnectionLayer 2 Connection

Same ELAN Subnet Same ELAN Subnet Could be via VLAN through Could be via VLAN through routers that support this.routers that support this.

Synchronization and Graceful Synchronization and Graceful switchoverswitchover

MGMG

Primary Data Center


Branch 1

Branch 3

Branch 2

PSTN

PSTNPSTN

PSTN

MGMG

MGMG

SSSS SSSS

SS = Signaling ServerSS = Signaling ServerMG = Media GatewayMG = Media GatewayTDM SetsTDM Sets

IP SetsIP Sets

SSSS

Branch Solution Options

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

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

MG1000B SMG1000E

Main Office can be any CS1000 system. Requires a Branch system and signaling server at the remote site to provide survivability.

Main Office must be a CS1000E system with distributed Media Gateways. Requires an alternate processor and signaling server at the remote site to provide survivability.

Enables IP Survivability only Enables both IP an TDM Survivability

Uses BUID for IP survivability Uses NUID for IP survivability

Limited to 400 IP users and 8 card slots for trunking DSPs, TDM sets.

No limit. Uses same TDM resources as main. Can support all IP sets of main.

No permanent IP users allowed on the Branch.

No permanent IP or TDM users allowed on the alternate processor of a Survivable Media Gateway.

90 day license period for all Branch IP Users.

Package 405 is required, and will limit use of IP sets and TDM sets on a Media Gateway to 90 days when in survivable mode.

SMG1000E versus MG1000B

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

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.

MG 1000B Resiliency

LAN

IP WAN

Rest of World

PSTN

Main Site

Large Campus Site

LAN

Branch Office

• 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

• 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

Call Server

Campus Media Gateways

MG 1000B

NormallySets Configured

and Managed from Main Site

Survivability

Sets Register to

local gateway in the case of

a WAN failure

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!

Redundant Call ProcessorRedundant Call Processor

QOS IP Network

Primary Data Center


Branch 1

Branch 3

Branch 2

PSTN

PSTNPSTN

PSTN

PSTN

Branch OfficeBranch Office

Survivable MGSurvivable MGIncludes Alternate Includes Alternate


TDM SetsTDM Sets

IP SetsIP Sets

SSSS

SSSS

Geographic Redundancy – Survivable Media Gateways

Synchronization and Synchronization and Graceful switchover Graceful switchover

Database ReplicationDatabase Replication

Alternate Call ProcessorAlternate Call Processor

Survivable MGSurvivable MG(no Call Server)(no Call Server)


QOS IP Network

Primary Data Center


Branch 3

Branch 2

PSTN

PSTN

PSTN

PSTN

MGMG



SSSS

Synchronization and Synchronization and Graceful switchover Graceful switchover Alternate Call ProcessorAlternate Call Processor

Primary Failure – Media Primary Failure – Media Gateways register to an Gateways register to an

alternate processor alternate processor



Branch 1


IP SetsIP Sets


QOS IP Network

Primary Data Center


Branch 3

Branch 2

PSTN

PSTN

PSTN

PSTN



SSSS

Synchronization and Synchronization and Graceful switchover Graceful switchover Alternate Call ProcessorAlternate Call Processor

IP Network Failure – Media IP Network Failure – Media Gateways register to a local Gateways register to a local

processor processor



Branch 1


IP SetsIP Sets

Network Resiliency

• Survivability at the branch Site’s 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.

Secondary NRS/GKPrimary NRS/GK

MG1000E

Call Server CPU0

PSTN

WAN

Redundancy for the remote sites WAN

MG1000E

MG1000E

MG1000E

MG1000E

Call Server CPU1

Datacenter 1 Datacenter 2

MG1000E

CORE SITE

Frågor ?

Documents

Nortel CS1000 Branch Office Solutions