MeshDynamics First With Persistent Voice Over Wireless Mesh

Distributed SIP Proxy and Back-up Registrar Functionality First
On-Board Application
SANTA CLARA, Calif.--(Business Wire)--
MeshDynamics' new Persistent Baseline Voice (PBV) technology
software option allows each of the company's MD4000 Third Generation
wireless mesh nodes to function as a back-up Voice-over-IP (VoIP)
server for mobile and highly survivable applications. The PBV option
incorporates a Session Initiation Protocol (SIP) Proxy Agent to
efficiently route SIP user agent and call set-up requests from
WiFi-connected handheld VoIP devices across the wireless network to
any SIP Registrar.

As user agents (typically individual VoIP phones) register with
the central server and call requests are received, each wireless mesh
node is also automatically maintaining a list of voice devices, along
with their location and address, in a Back-up SIP Registrar. The SIP
information gleaned by each individual wireless mesh node is also
shared with all other nodes in the network automatically to create a
complete back-up SIP Registrar in every node. Voice traffic is
automatically routed via the most efficient path through the network.

If the wireless mesh network becomes divided, connection to the
central SIP registrar may be lost. Without PBV, this would mean that
no new voice calls could be initiated in the isolated segments of the
mesh network. In many environments, such as underground mining and
mobile military applications, this is unacceptable. But Persistent
Baseline Voice technology allows new calls to continue to be made
within the isolated network segments transparently to the user, who
simply dials the usual extension number. One of the wireless mesh
nodes in the isolated segment takes over as the SIP Registrar,
"spoofing" the original SIP Registrar whose connection has been lost.
This allows connectivity between all phones in the isolated segment in
the normal fashion. Because the Back-up SIP Registrars in every node
in the network have the same information, user devices may roam
between the isolated segments and still connect as normal. When the
connection between the isolated segments is restored and the original
SIP Registrar is again available, the PBV Back-up Registrars
immediately go off-line and return to listening mode.

Persistent Baseline Voice technology combines with another
MeshDynamics software feature, Persistent Third Generation Mesh (P3M)
to allow these segments to operate efficiently in isolation and
immediately rejoin the original network as soon as possible. In a
mobile environment, networks may form and reform as vehicles move in
and out of range of one another. In an underground mining environment,
each portion of the network isolated by a cave-in can remain active,
with individual mine personnel remaining in voice contact through the
PBV features.

Persistent Voice technology is the first of many applications
which will operate on the Wireless Mesh Nodes alongside the mesh
networking software. Francis daCosta, Founder and CTO of MeshDynamics,
indicated that the company expects to incorporate a variety of
applications required by users, such as sensor integration. "Our basic
architecture has been designed to permit rapid development of
additional functionality. There are many user needs that are best
served by distributing the application through the mesh network and it
will become an increasingly important distinction for our products. As
we move beyond basic data transport, many of these on-board
applications will integrate, classify, and distill data and events
from the remote points to add intelligence and value to what is shared
across the network."

The Persistent Baseline Voice software option is available now and
priced at $300 per MD4000 wireless mesh node. Existing customers may
contact the company to inquire about upgrades.

About MeshDynamics, Inc.

MeshDynamics delivers one of the only third-generation wireless
mesh networking solutions for high-performance outdoor data, voice,
and video networking. Based on sophisticated dynamic channel-agile
networking algorithms, MeshDynamics' MD4000 family of Structured
Mesh(TM) wireless nodes deliver very low-latency and low-jitter
performance, even over multi-hop topologies where many earlier
generation wireless mesh networking products fail. MeshDynamics'
products are in use worldwide in mining and industrial, homeland
security/defense, transportation, and metro/municipal network
applications. MeshDynamics, Inc. is privately held and headquartered
in Santa Clara, CA. More information at: www.meshdynamics.com

MeshDynamics, Inc.
Byron Henderson, 408-398-6395
news@meshdynamics.com

Copyright Business Wire 2008