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
Call ServerCall Server
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
Secondary 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
Secondary Data Center
Branch 1
Branch 3
Branch 2
PSTN
PSTNPSTN
PSTN
PSTN
Branch OfficeBranch Office
Survivable MGSurvivable MGIncludes Alternate Includes Alternate
Call ServerCall Server
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)
Redundant Call ProcessorRedundant Call Processor
QOS IP Network
Primary Data Center
Secondary Data Center
Branch 3
Branch 2
PSTN
PSTN
PSTN
PSTN
MGMG
Survivable MGSurvivable MGIncludes Alternate Includes Alternate
Call ServerCall Server
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
Geographic Redundancy – Survivable Media Gateways
Survivable MGSurvivable MG(no Call Server)(no Call Server)
Branch 1
SS = Signaling ServerSS = Signaling ServerMG = Media GatewayMG = Media GatewayTDM SetsTDM Sets
IP SetsIP Sets
Redundant Call ProcessorRedundant Call Processor
QOS IP Network
Primary Data Center
Secondary Data Center
Branch 3
Branch 2
PSTN
PSTN
PSTN
PSTN
Survivable MGSurvivable MGIncludes Alternate Includes Alternate
Call ServerCall Server
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
Geographic Redundancy – Survivable Media Gateways
Survivable MGSurvivable MG(no Call Server)(no Call Server)
Branch 1
SS = Signaling ServerSS = Signaling ServerMG = Media GatewayMG = Media GatewayTDM SetsTDM Sets
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