Title: Nortel CS1000 Branch Office Solutions
1Nortel CS1000Branch Office Solutions
- Asko Hotakainen
- Senior Sales Engineer
2Agenda
- Introduction
- Call Server and Media Gateways
- High Availability
- N-Way Geographic Redundancy (MG1000E)
- Branch Office (MG1000B)
- IP Phones
- Building Resilient Networks to support CS1000
3Introduction
- 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
4Branch 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.
5What 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
6PBX Networking
Site 2
Site 1
Call Server
Call Server
SS
SS
MG
MG
PSTN
PSTN
QOS IP Network
7Core 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
8Branch 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
9MG1000E 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
10MG1000B
- 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
11SMG1000E versus MG1000B
12Geographic 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
13GR 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.
14MG 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!
15Geographic 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
16Geographic 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
17Geographic 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
18Network 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.
19Redundancy for the remote sites WAN
CORE SITE
Datacenter 1
Datacenter 2
MG1000E
MG1000E
Call Server CPU0
Call Server CPU1
MG1000E
WAN
MG1000E
MG1000E
MG1000E
20Frågor ?