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Solutions By QOS For VoIP
QoS tools or Appliance are available in the market. These are basically
used in enterprise solutions which have an intranet LAN or WAN network.
These devices
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Queuing is a process that occurs at the router. In case
of Voice and Data packets, a priority-based queue adopted to allow
voice/real time applications before the data.
Loss of packets that is the result of it being dropped
by the router due to congestion is another major trouble. This is
an issue that can be minimized with better error detection and correction
schemes at the receiver.
Priority of Packets on the IP network is also an issue
that has been dealt with in the recent past and IETF recommendations
have been implemented in protocols. The IP header contains a field
Type of Service” that indicated priority. Time sensitive
protocols like SNA-Systems Network Architecture or SDLC.- Synchronous
Data Link Control
For the IP network another protocol is the RSVP- Resource
Reservation Protocol which still faces a bottleneck with the routers
that cannot implement it along the network. Another alternative
is the DiffServ- Differentiated Services.
MPLS- Multi Protocol Label Switching is another protocol,
which works with IP, ATM-Asynchronous Transfer Mode and frame relay
and fixes predetermined paths to network traffic. When this is combined
with other applications that does packet shaping it maintains the
quality no matter what traffic is generated on the network.
Qos for VoIP is thus priority based transfer across the network
in other words it is a network management tool to avoid congestion,
latency and increase link efficiency. Cisco IOS QoS is a tool box,
and many tools can accomplish the same result. Others include Kentrox
Q1300, Kentrox Q2300, ipConductor QoS appliance etc. It is up to
you to look at the traffic and see which it the best for you. These
software tools have bandwidth management that can be set up in routers
through a graphic user interface. And support the various means
of implementing QoS for VoIP like MPLS, DiffServ, RSVP etc. Many
of these tools are optimized to work over different types of networks
like ATM and Frame relays as well.
Soft Phone
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