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Asterisk
High
Availability
Design
GuideVoIP Conference – High Availability
January 27, 2016
® The Asterisk speech bubble is a registered trademark of Digium
Must Have
 Fully autonomous peers
 Support for system 
configuration differences 
between peers
Avoid
 Shared hardware (e.g. 
channel bank)
 Shared logical devices
 Locally attached trunks / 
phones
Autonomy
Peers must be fully autonomous
Failure or data corruption of one peer must not adversely affect 
the other
Must Have
 Synchronization of 
programs, data, and 
configuration
 Synchronization of non‐
Asterisk files / databases
Avoid
 Common disk (DRBD, iSCSI)
 Network share (NFS / CIFS)
Synchronization
Peers must remain in sync so they can take over immediately 
without needing to copy data
Peers must not sync if either peer is not in optimal health
Must Have
 Internal process awareness
 Hardware awareness
 External environment 
awareness
Avoid
 Simple process monitoring
 Dependence on Asterisk to 
reports its own health
Failure Detection
Detect ability of Asterisk to bridge calls and serve the needs of 
internal and external callers
Must Have
 Network latency 
compensation
 Adjustable latency 
fluctuation control
Avoid
 LAN based device sharing 
(DRBD, NFS)
 USB based device sharing
Geographic Separation
Peers must be able to operate equally well whether in a single 
data center or in separate data centers on different continents
Must Have
 VoIP IP address moves with 
active peer
 Rapid failover
 Complete transparency
Avoid
 Dependence on multiple 
server registration by phone
 Introduction of single point 
of failure (device) in front of 
Asterisk peers
Transparency
Upstream trunks must not be aware of failover
Downstream phones must not be aware of failover
Must Have
 Direct access to trunks 
and/or phones
Avoid
 Any shared device in front 
of cluster
 Claims of proprietary call 
salvage devices
Single Point of Failure
Peers should not be dependent on a single device in front of 
cluster (e.g.: for ‘call survival’ on failover)
These devices introduce more problems (single point of failure) 
than they solve.   They also don’t work in real world scenarios.
Must Have
 Encryption of peer control 
channel
 Encryption of data 
synchronization protocol
Avoid
 Unencrypted network 
storage (DRBD, NFS)
Encryption
Communications between peers must be fully encrypted
Essential where NG911 and Sarbanes Oxley regulations apply
Common sense in era of ubiquitous hacking
Free
• Flipit
• DRBD + Heartbeat
• Ultramonkey
• More
Commercial
• HAAst (High Availability for 
Asterisk)
• Stratus
• Shmooze
Cost vs Capabilities
Broad spectrum of products ranging in capabilities and performance
Beware of vendors charging for open source tools (e.g.: DRBD + 
Heartbeat) rebranded as their own
Try before you buy!
Conclusions
• A number of products on the market
• Almost all are at the low‐end of the capability and performance spectrum
• Vendors rebranding free tools is concerning
• Vendors hiding use of unsuitable technology (DRBD) in their products to 
solve synchronization problem
• All solutions perform great in simplest tests
• Only one product (HAAst) actually survived continuous failover and extreme 
tests
• The “right” product depends on the cost of an outage to your telephony 
environment
• If you don’t need the high‐end product (HAAst) consider building your own 
with ‘flipit’ and NFS share/DRBD – but understand what you are trading off
• Don’t pay a vendor for a rebranded open source product
Thank you!
Robert Knowles
Vice President VoIP Solutions
Globe Telecom

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