KPI Analysis tab

Call Setup Time

Time taken from initial SIP INVITE to the first ringing notification (180 Ringing) or call acceptance (200 OK).
This KPI helps assess the responsiveness of the IMS network in setting up voice calls and can indicate potential latencies in the call setup procedure.

milliseconds

Duration between first SIP INVITE message and the 180 Ringing response (or 200 OK if no ringing message exists).

Call Duration

Duration of an active call from establishment to termination.
This KPI provides insight into typical call duration patterns.

milliseconds

Duration between SIP 200 OK response to INVITE and the first BYE/CANCEL message.

Call Lag

Time taken to receive a successful response to a SIP INVITE request.
This KPI helps identify potential processing delays in the IMS core network that could impact call setup experience.

milliseconds

Duration between primary SIP INVITE request and its corresponding 200 OK response.

Device Time For Session Establishment

Time taken for a device to establish a data session on the network.
This KPI helps evaluate the performance of the 4GNSA/5GSA core network in establishing data sessions.

milliseconds

For 5G: Duration between PDU session establishment request and accept messages. For 4G/5G NSA: Duration between PDN connectivity request and accept messages.

Device Time To Registration

Time taken for a device to complete network registration.
This KPI helps evaluate the performance of the 5G core network in registering devices.

milliseconds

Duration between NAS-5GS Registration request and Registration accept messages.

Control Plane Latency

Average response time for control plane protocol messages.
This KPI helps identify potential bottlenecks in signaling and control procedures.

milliseconds

Average of all response_time values for control plane protocols.

User Plane Latency

Response time for user plane protocol messages (TCP, ICMP, ICMPv6, DNS, TLS).
This KPI helps evaluate the performance of the data plane and identify potential issues affecting application performance.

milliseconds

First non-N/A result from various user plane protocol latency calculations.

Mobility Interruption Time

Time taken to complete a handover between networks.
This KPI helps evaluate handover performance between 4G and 5G networks and the potential service interruption experienced during handovers.

milliseconds

Duration between first and last GTPv2 message on N26 interface.

Call Mean Opinion Score

A measure of voice quality as perceived by users.
This KPI provides an easily understandable quality rating that correlates with user experience and satisfaction with voice calls.

Scale 1-4.5

Calculated from R-Factor using ITU-T G.107 conversion formula.

Call R-Factor

A comprehensive voice quality metric that considers multiple impairment factors.
This KPI provides a detailed technical assessment of voice quality that considers multiple factors affecting transmission quality, making it useful for network engineers to diagnose specific issues.

Scale 0-100

Calculated using the ITU-T G.107 E-model algorithm considering delay, jitter, packet loss, and codec.

Call Mean Jitter

Average variation in packet arrival times.
This KPI helps identify network stability issues that can cause voice interruptions or choppy audio even when packet loss is minimal.

milliseconds

Measured directly from RTP stream analysis.

Call Total Delay

End-to-end network delay for voice packets.
This KPI helps identify when network latency is high enough to cause noticeable conversation delays, which can lead to participants talking over each other.

milliseconds

Base network delay (50ms) + measured delta between packets.

Call Packet Loss Rate

Percentage of voice packets lost during transmission. This KPI helps identify network congestion or connectivity issues that can cause audio dropouts (short gaps or long gaps) or severe quality degradation.

Percentage

(Lost Packets / Total Packets) × 100.