This Recommendation describes recommended objective models for non-intrusive monitoring of the video quality of IP-based video services based on packet-header and bitstream information. This Recommendation addresses two application areas: ?C [ITU-T P.1202.1] specifies the model algorithm for the lower resolution (LR) application area@ including services such as mobile TV. ?C [ITU-T P.1202.2] specifies the model algorithm for the higher resolution (HR) application area@ which includes services such as IPTV. This application area is currently under study but not yet completed. These models are restricted to information contained in packet headers@ the packet bitstream (payload information)@ prior and static knowledge about the media stream and dynamic buffering information from the client. [ITU-T P.1202.1] consists of one model. [ITU-T P.1202.2] consists of two models corresponding to two modes: mode 1 and mode 2@ which both are no-reference (i.e.@ non-intrusive) models. Mode 1 refers to a parsing mode; the model operates by analysing information in the video bitstream without fully decoding the bitstream (i.e.@ no pixel information is used) for MOS estimation. Mode 2 refers to a full decoding mode@ in addition to the bitstream information which mode 1 uses@ the model can also decode parts or all of the video bitstream (i.e.@ pixel information is used) for mean opinion score (MOS) estimation. Further client specific information@ such as concealment type@ is provided to the algorithm out-of-band@ for example in the form of stream specific side information. These models predict video quality in terms of MOSs on a five-point ACR scale (see [ITU-T P.910]). The primary application for these models is the monitoring of transmission quality during service operation or for maintenance purposes. The ITU-T P.1202 model may be deployed both in end-point locations and at mid-network monitoring points. The location of the model and the location of the measurement probe together determine the mode of operation@ as described in more detail in clause 6.1. The primary quality prediction made by such models is based on the payload of the stream being analysed. Therefore@ this Recommendation can provide a comprehensive evaluation of quality as perceived by a particular end-user because its scores can reflect the impairments on the coding and the Internet Protocol (IP) network being measured@ which differ from user to user. This Recommendation cannot provide a comprehensive evaluation of video quality as perceived by a particular end-user@ because its scores reflect the impairments due to encoding and the subsequent IP network being assessed@ which may only be one part of the end-to-end connection. An explicit inclusion of processing steps such as content contribution from e.g.@ satellite networks@ display properties etc. are not considered. See Table 3 for more information. Further@ the quality-impact due to a specific video encoder implementation or a specific decoder-side packet loss concealment implementation is not explicitly addressed. Instead@ the models have been developed for a set of dedicated service implementations@ which are assumed to be meaningful representations of today's IP-based streaming video services. As a consequence@ however@ in case of significant deviations of a given service being assessed from the service configurations used for developing this standard@ it is possible to obtain high quality scores with this Recommendation and yet to have a poor quality of the stream as it is perceived by actual users. As a consequence@ this Recommendation can be used for applications such as: ?C in-service quality monitoring for specific IP-based audiovisual services@ as specified in more detail in Tables 4 to 7; ?C benchmarking of different service implementations. However@ it cannot be used for direct benchmarking of different decoder implementations. The implementations that can be assessed with ITU-T P.1202 include the encoding aspects and potential packet loss.