# IP SLA (Service-Level Agreement) on Cisco IOS **URL:** https://forum.networklessons.com/t/ip-sla-service-level-agreement-on-cisco-ios/789 **Category:** Lessons Discussion **Created:** [December 15, 2016, 11:29am UTC](https://forum.networklessons.com/t/ip-sla-service-level-agreement-on-cisco-ios/789 "2016-12-15T11:29:10Z") **Posts on this page:** 1 **Showing post:** 6
### Author: ![andajose](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/a/a183cd/32.png) [@andajose](https://forum.networklessons.com/u/andajose) #### Post date: [March 9, 2016, 5:00am UTC](https://forum.networklessons.com/t/ip-sla-service-level-agreement-on-cisco-ios/789/6 "2016-03-09T05:00:52Z")
For whomever do not know what MOS means, I just wanted to share some basic info: Mean opinion score (MOS) VoIP measurements are collected for after testing the one-way delay or the latency of the connection, packet loss with a metric to include the number of consecutive packets lost, and the amount jitter (difference in time it takes packets to arrive). Calculations then factor an R Factor that can be used to estimate a MOS score. MOS has a subjective measurement where listeners would sit in a “quiet room” and score call quality as they perceived it Mean opinion score (MOS) MOS Quality Impairment 5 Excellent Imperceptible 4 Good Perceptible but not annoying 3 Fair Slightly annoying 2 Poor Annoying 1 Bad Very annoying --- _[View the full topic](https://forum.networklessons.com/t/ip-sla-service-level-agreement-on-cisco-ios/789)._