1. Nortel CS1000 Branch 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.

5. What are the Options for a remote site
Call Server (traditional PBX networking)
MG1000E
No survivability
SMG1000E
Survivable
limited application support
MG1000B
SW compatibility with core, limited configuration integration, limited scalability max 400 users
SRG
Survivable (up to 80 IP users)
no configuration integration

6. PBX Networking Site 2 Site 1 PSTN PSTN QOS IP Network Call ServerSS SS MG
Scenario 1
Campus Redundancy
Applies to a CS1000E system
All components in the system communicate to a single IP address
In case of a switchover, the processor taking control also assumes this IP address
Both processors MUST be on the same subnet
Physical separation of redundant call server is over a layer 2 network
This allows the subnet to be extended to the locations of both processors
This can be accomplished by setting up a VLAN through the layer 3 infrastructure
Seamless switchover
No impact to active calls
IP sets do not need to re-register
Applications are not affected by the switchover
No additional management
Data on active is automatically duplicated on the inactive processor
Switchover can be configured to occur daily
Supports Branch Office, SRG and remote media gateways
Protects users at these locations from IP network failure
Branch and SRG are managed independently MG
PSTN
PSTN
QOS IP Network

7. Core site(s) with High Availability
Secondary Data Center
Primary Data Center
Synchronization and Graceful switchover
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
Scenario 1
Campus Redundancy
Applies to a CS1000E system
All components in the system communicate to a single IP address
In case of a switchover, the processor taking control also assumes this IP address
Both processors MUST be on the same subnet
Physical separation of redundant call server is over a layer 2 network
This allows the subnet to be extended to the locations of both processors
This can be accomplished by setting up a VLAN through the layer 3 infrastructure
Seamless switchover
No impact to active calls
IP sets do not need to re-register
Applications are not affected by the switchover
No additional management
Data on active is automatically duplicated on the inactive processor
Switchover can be configured to occur daily
Supports Branch Office, SRG and remote media gateways
Protects users at these locations from IP network failure
Branch and SRG are managed independently MG
PSTN
PSTN
QOS IP Network

8. Branch Solution Options
Secondary Data Center
Primary Data Center
Synchronization and Graceful switchover
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
Branch 3
Branch 1
Branch 2 MG SS
IP Sets
PSTN
PSTN
SS = Signaling Server
MG = Media Gateway
TDM Sets

9. 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

10. 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

11. SMG1000E versus MG1000B 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.

12. 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

13. 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.

14. 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
Campus Media Gateways
MG 1000B
Call Server
PSTN
LAN
Survivability
Sets Register to local gateway in the case of a WAN failure
LAN
IP WAN
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!

15. Geographic Redundancy – Survivable Media Gateways
Primary Data Center
Redundant Call Processor
Secondary Data Center
Synchronization and Graceful switchover
Alternate Call Processor
PSTN
PSTN
QOS IP Network
Database Replication
Branch 3 SS
Branch 1
Can mix CPPIV and CPPM as processor types in single system… SS
Branch 2
Survivable MG
Includes Alternate Call Server
Branch Office
IP Sets
PSTN
Survivable MG
(no Call Server)
TDM Sets
PSTN
PSTN

16. Geographic Redundancy – Survivable Media Gateways
Primary Data Center
Redundant Call Processor
Secondary Data Center
Synchronization and Graceful switchover
Alternate Call Processor
Primary Failure – Media Gateways register to an alternate processor
PSTN
PSTN
QOS IP Network
Branch 3 SS
Branch 1
Branch 2
Survivable MG
Includes Alternate Call Server
IP Sets
PSTN
Survivable MG
(no Call Server) MG
SS = Signaling Server
MG = Media Gateway
TDM Sets
PSTN

17. Geographic Redundancy – Survivable Media Gateways
Primary Data Center
Redundant Call Processor
Secondary Data Center
Synchronization and Graceful switchover
Alternate Call Processor
IP Network Failure – Media Gateways register to a local processor
PSTN
PSTN
QOS IP Network
Branch 3 SS
Branch 1
Branch 2
Survivable MG
Includes Alternate Call Server
IP Sets
PSTN
Survivable MG
(no Call Server)
SS = Signaling Server
MG = Media Gateway
TDM Sets
PSTN

18. 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.

19. Redundancy for the remote sites WAN
CORE SITE
Datacenter 1
Datacenter 2
PSTN
MG1000E
MG1000E
Primary NRS/GK
Secondary NRS/GK
Call Server CPU0
Call Server CPU1
MG1000E
WAN
MG1000E
MG1000E
MG1000E

20. Frågor ?