The Only Commercially- Supported Complete Failover Solution for Asterisk
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1 The Only Commercially- Supported Complete Failover Solution for Asterisk TwinStar Winner of IT Expo Best of Show Asterisk is a registered trademark of Digium, Inc.
2 Agenda Downtime is the Enemy The Key is in the Architecture Complete Failover Solution Additional Reliability Tools Review of Key Points Questions & Answers
3 THIS WEBINAR IS BASED ON A SINGLE, SIMPLE PREMISE
4 You!!
5 ipbx is great-but what about reliability?!
6 Traditional ipbx Redundancy Characteristics Duplicate servers Server failure necessitates manual intervention Start backup Re-attach cables to telephony modules Drawbacks Expensive Time-consuming May take hours or even days to fix
7 THE KEY IS IN THE ARCHITECTURE
8 Introduction to Xorcom Established in 2004 Flexible and modular telephony interface solutions based on XPP technology (USB2) Xorcom drivers: standard component in Asterisk since v (Feb 06) Worldwide distribution & OEM channels OEM Distributor
9 New Standard for Asterisk Connectivity
10 XPP: Unique Platform for Telephony High speed 480 Mbit/s USB2 connectivity Supports very high densities Theoretical uncompressed voice: 2,400 calls/usb Full support for fax and modems Modular and scalable Additional ports are hot pluggable Simple integration and maintenance
11 Astribank Overview Direct USB connection to Asterisk server Drivers are native in Asterisk Auto detection of analog/digital ports as Zaptel/DAHDI devices Full telephony connectivity: FXS, FXO, PRI (E1/T1), T1 CAS, E1/R2, BRI ISDN All units are TwinStar -ready USB * Astribank
12 COMPLETE FAILOVER SOLUTION TwinStar Winner of IT Expo Best of Show
13 Hot Failover Xorcom Approach Provides full redundancy for a complete PBX system by avoiding single point of failure Auto detection of server failure and instant switch to backup server Re-establishes communication for: IP telephones FXO circuits: standard analog phone lines FXS circuits: analog telephones and devices, such as fax machines Digital trunks: E1/T1 PRI, E1 R2, T1 CAS, BRI ISDN SIP trunks Digital (ISDN) phones
14 Components Duplicate synchronized servers redundant power External telephony modules housed in USB-connected Astribank Firmware-based switching mechanism that is not network-dependent
15 Initial Setup: Identical Servers Two Xorcom servers + dual-usb Astribank USB Xorcom server (primary) Xorcom server (backup) USB LAN/WAN PSTN IP Phones Astribank (front panel) telephony interfaces Analog Phones
16 Standard Operation: Primary Active Dual USB ports; Firmware monitoring/switching USB Xorcom server (primary) Xorcom server (backup) USB LAN/WAN PSTN IP Phones Astribank (rear panel) telephony interfaces Analog Phones
17 If the Primary Server Fails Server Failure USB Xorcom server (primary) Xorcom server (backup) USB LAN/WAN PSTN IP Phones Astribank (rear panel) telephony interfaces Analog Phones
18 the Backup Server is Activated Switch Changes to Backup Server Backup Server assumes Primary Server IP Address USB Xorcom server (primary) Xorcom server (backup) USB LAN/WAN PSTN IP Phones Astribank (rear panel) telephony interfaces Analog Phones
19 HOW IT WORKS
20 Asterisk High Availability Cluster Two servers comprise the cluster Each has a private IP address Server management and configuration replication performed via IP network VoIP PBX extensions use special public/cluster IP address to communicate with PBX cluster In case primary server fails, the cluster IP address is automatically activated on backup IP phones continue to use same PBX IP address
21 Network Schematic
22 DRBD DRBD=Distributed Replication Block Device used to replicate server configuration files All files to be replicated need to be allocated in DRBD partition Asterisk configuration files MySQL database Web server DRBD is mounted on the primary server only, to avoid simultaneous modification of files
23 Replication of Disk Blocks
24 High Availability Software Xorcom uses USB Watchdog protocol Detects server failure Forces backup to take charge Monitors: voltage availability on each Astribank USB port continuity of communication between Astribank and DAHDI driver
25 In Case of Server Failure Astribank deactivates primary server USB port and activates backup server USB port Plug-and-Play event launched on backup, calls scripts to check that all devices have switched Additional script: registers and configures Astribank channels on DAHDI mounts DRBD partition to enable Asterisk and MySQL activates shared IP starts MySQL, Asterisk and Apache services
26 Which Failures are Caught? TwinStar monitors voltage of the active USB port and communication with DAHDI driver Switchover to backup server will occur if: The server is switched off (no power) The server crashes The Astribank driver stops working Linux kernel crash Driver unloaded The USB cable is disconnected Switchover can be customized to use Monit or Linux Heart Beat to catch other failures
27 Additional Information Xorcom provides pre-configured synchronized TwinStar-ready XR2000 and XR3000 appliances Xorcom does not provide tech support for: DRBD any server monitoring software hardware packages on third party hardware Soon-to-be-Published: Guide for configuring plain vanilla Elastix for TwinStar-supported Astribank cluster
28 Notes for Non-Xorcom Servers Need DAHDI 2.2 or higher (no Zaptel) PBXs must be identical in configuration and capabilities, synchronized continuously in real-time Installing TwinStar Astribanks as part of a solution based on non-xorcom IP-PBX does not provide an out-of-the-box highavailability solution for IP telephony Consult How it Works document for tips
29 Support for Non-Xorcom Servers Xorcom supports only USB switching between primary and backup Xorcom is not responsible for the correct operation of the synchronization, IP telephony high-availability, and other features that are not directly related to the Astribank operation Xorcom is not obligated to instruct the integrator on how to build such a system
30 ADDITIONAL RELIABILITY TOOLS
31 Additional Tools Telephony interface power supply redundancy Load balanced power Redundancy Notifications Internal hardware redundancy RAID1 External backup and restore Fan redundancy Smart fan control
32 Review of Key Points TwinStar is the only commercially-supported hot fail-over solution for Asterisk-based PBX Re-establishes communication for: IP telephones FXO circuits: standard analog phone lines FXS circuits: analog telephones and devices, such as fax machines Digital trunks: E1/T1 PRI, E1 R2, T1 CAS, BRI ISDN SIP trunks Digital (ISDN) phones No manual intervention required!!
33 Questions? You don t know what you don t know until someone else asks the question
34 Thank You
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