![]() ![]() ![]() |
Cisco IPSLA monitor or VoIP monitor comes as an add-on feature in OpManager and requires licenese to run. OpManager continuously monitors the key performance metrics of the VoIP network to determine its health. The parameters measured include Jitter, Latency, Packet Loss, etc.
Jitter: Jitter indicates a variation in delay between arriving packets (inter-packet delay variance). Users often experience uneven gaps in speech pattern of the person talking on the other end, and sometimes there are disturbing sounds over a conversation coupled with loss of synchronization etc.
Latency: The delay measured is the time taken for a caller's voice at the source site to reach the other caller at the destination site is called as latency. Network latency contributes to delay in voice transmission, resulting in huge gaps between the conversation and interruptions.
Packet Loss :
Packet loss is a measure of the data lost during transmission from one
resource to another in a network. Packets are discarded often due to
network latency.
How it works
OpManager primarily relies on Cisco's IP-SLA
for monitoring the VoIP and the prerequisite therefore is, that the
device should be a Cisco Router and must have IPSLA agent enabled
on
it. From IOS Version 12.3(14)T all Cisco routers support monitoring of
VoIP QoS metrics.
Cisco's IPSLA, an active
monitoring feature of Cisco IOS software, facilitates simulating and
measuring the above mentioned parameters to ensure that your SLAs are
met.
Cisco IP SLA provides a UDP jitter
operation where UDP packets are sent from the source device to a
destination device. This simulated traffic is used to determine the
jitter, the round-trip-time, packet loss and latency. This data is
gathered for multiple tests over a specified period to identify how the
network performs at different times in a day or over a few days. The
VoIP monitor gathers useful data that helps determine the performance
of your VoIP network, equipping you with the required information to
perform network performance assessment, troubleshooting, and continuous
health monitoring.
![]() ![]() ![]() |