Nortel CS1000
Branch 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
PBX Networking
Site 2
Site 1
Call Server
Call Server
SS
SS
MG
MG
PSTN
QOS IP Network
PSTN
Core site(s) with High Availability
Primary
Data Center
Call Server Active Core
Synchronization and Graceful
switchover
Secondary
Data Center
Call Server Inactive Core
Layer 2 Connection
SS
Same ELAN Subnet
Could be via VLAN through
routers that support this.
SS
MG
MG
PSTN
QOS IP Network
PSTN
Branch Solution Options
Primary
Data Center
Call Server Active Core
Synchronization and Graceful
switchover
Secondary
Data Center
Call Server Inactive Core
Layer 2 Connection
SS
Same ELAN Subnet
Could be via VLAN through
routers that support this.
SS
MG
MG
PSTN
QOS IP Network
PSTN
Branch 3
Branch 1
Branch 2
MG
SS
PSTN
IP Sets
TDM Sets
SS = Signaling Server
MG = Media Gateway
PSTN
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
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.
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
• 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
Branch Office
Large Campus Site
Rest of World
Campus Media
Gateways
MG 1000B
Call Server
PSTN
LAN
LAN
IP WAN
NRS
Survivability
Sets Register to
local gateway in the
case of a WAN
failure
Normally
Sets Configured
and Managed from
Main Site
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!
Geographic Redundancy – Survivable Media Gateways
Primary
Data Center
Redundant Call Processor
Synchronization and
Graceful switchover
PSTN
Alternate Call Processor
Secondary
Data Center
PSTN
QOS IP Network
Database Replication
SS
Branch 3
Branch 1
SS
Survivable MG
Includes Alternate
Call Server
Branch 2
Branch Office
IP Sets
TDM Sets
Survivable MG
(no Call Server)
PSTN
PSTN
PSTN
Geographic Redundancy – Survivable Media Gateways
Primary
Data Center
Redundant Call Processor
Synchronization and
Graceful switchover
Alternate Call Processor
Secondary
Data Center
Primary Failure – Media
Gateways register to an
alternate processor
PSTN
PSTN
QOS IP Network
SS
Branch 3
Branch 1
Survivable MG
Includes Alternate
Call Server
Branch 2
IP Sets
TDM Sets
SS = Signaling Server
MG = Media Gateway
Survivable MG
MG
(no Call Server)
PSTN
PSTN
Geographic Redundancy – Survivable Media Gateways
Primary
Data Center
Redundant Call Processor
Synchronization and
Graceful switchover
Alternate Call Processor
Secondary
Data Center
IP Network Failure – Media
Gateways register to a local
processor
PSTN
PSTN
QOS IP Network
SS
Branch 3
Branch 1
Survivable MG
Includes Alternate
Call Server
Branch 2
IP Sets
TDM Sets
SS = Signaling Server
MG = Media Gateway
Survivable MG
(no Call Server)
PSTN
PSTN
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.
Redundancy for the remote sites WAN
CORE SITE
Datacenter 1
MG1000E
Call Server CPU0
Datacenter 2
MG1000E
PSTN
Call Server CPU1
Secondary NRS/GK
Primary NRS/GK
MG1000E
WAN
MG1000E
MG1000E
MG1000E
Frågor ?