This Recommendation provides specifications for talker echo control. The intention of this Recommendation is to ensure the acceptable echo performance on international (and national) connections. The specifications include a maximum transmission time (delay) limit beyond which an active echo control device has to be deployed. In addition, application and engineering rules related to connections with echo control devices as well as connections not requiring active echo control are given. Recognizing that some network operators may want to deploy echo control devices in connections with less transmission time than the limit specified in this Recommendation (e.g. if better echo performance is desired), talker echo tolerance curves are also included in this Recommendation and examples on how they can be used to evaluate effects of echo in specific network scenarios are given in Appendix I.