Qos Probe IAX (IPQ1)

Description

This probe configures an IAX trunk to send test traffic over the network to another SOP or third party system. It then measures various quality parameters of the return traffic.

Release notes

Resource configuration interface

Resource parameters

• Remote host: Identifier of the remote host. It can be an IP address, a SOP key or 'dynamic' if the remote peer will register itself to this SOP
• Probe ID: Unique id to be used in the IAX peer name to uniquely identify this probe. This ID must be the same on both SOPS.
• Require calltoken: Set this to 'no' on sops that run the Communication Server module to ensure compatibility between SOPS running the asterisk-1.2x module and the Communication Server module.
• RTT Levels: Allows you to set the warning and critical levels of the probe's round-trip time.Default value for warning is 50 and critical 100 (in ms).
• Jitter Levels: Allows you to set the warning and critical levels of the probe's jitter. Default value for warning is set to 50 and cricital 100 (in ms).
• Packet Loss Levels: Allows you to set the warning and critical levels of the packets's loss. Default value warning is set to 1 and critical 2 (in percent).
• Test call duration: Allows you to set the test call duration in seconds. Short duration may cause no data warnings. By default this value is set to 82800.

Performance graphs

This probe generates a graph with following performance metrics:

• Round Trip Time: the time in milliseconds between when a packet was sent and when the response was received back.
• Jitter: the variation of the round trip time (difference between min and max).

A second graph is generated with following performance metrics:

• lost packets/s: the number of packets that the probe detects as being lost in the network.
• dropped packets/s: the number of packets that the SOP purposely dropped to lower the latency.
• out of order packets/s: the number of packets that the probe received from the network in a different order than they were sent.
• total packets/s: the total number of packets received from the network.

Alarms

This probe can report following alarm states:

• WARNING: any of the following conditions hold:
  • Round Trip Time >= 50 ms (or the defined value 1.8+)
  • Jitter >= 50 ms (or the defined value 1.8+)
  • Packet Loss > 1 % (or the defined value 1.8+)
  • No data: There is no data transmitted
• CRITICAL: any of the following conditions hold:
  • Round Trip Time >= 100 ms (or the defined value 1.8+)
  • Jitter >= 100 ms (or the defined value 1.8+)
  • Packet Loss > 2 % (or the defined value 1.8+)

Possible causes

No data warning is usually raised when:

• Data is checked just after the starting of the test call.

A high round trip time, jitter or packet loss is usually caused by:

• Congestion in the network.

Possible consequences

A high round trip time, jitter or packet loss can have following consequences:

• Degraded audio quality.

Possible actions

• Capture network traffic to see what is causing the congestion.

Post install actions

When this probe is added or upgraded, you need to reinstall the SNMP Agent module.