Transcript Document
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 ?