In large-scale applications, such as in [[Internet Protocol Televisiontelevision]] (IPTV), very long delays (minutes to hours) between RTCP reports may occur, because of the RTCP bandwidth control mechanism required to control congestion (see [[#Protocol functions|Protocol functions]]). Acceptable frequencies are usually less than one per minute. This affords the potential of inappropriate reporting of the relevant statistics by the receiver or causes evaluation by the media sender to be inaccurate relative to the current state of the session. Methods have been introduced to alleviate the problems:<ref>Vít Novotný, Dan Komosný, ''Large-Scale RTCP Feedback Optimization'', Journal of Networks, Vol.3 (3), March 2008</ref> RTCP filtering, RTCP biasing and [[RTCP hierarchical aggregation|hierarchical aggregation]].<ref>
[http://www.academypublisher.com/jnw/vol03/no03/jnw03030110.pdf Realtime control protocol and its improvements for Internet Protocol Television]</ref>
