Page 1581 of 1814International ISDN PRI Feature description and administration1622Trunk Anti-TromboningContentsThe following are the topics in this section:Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1581Example of an anti-tromboning operation . . . . . . . . . . . . . . . . . . . . 1583Anti-tromboning scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1584Trunk Anti-Tromboning and Trunk Optimization - Before Answerboth equipped on the same Meridian 1 . .. . . . . . . . . . . . . . . . . . . . . 1593Operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1605Feature interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1606Feature packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1619Feature implementation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1620Task summary list . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1620Feature Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1621Feature descriptionThe purpose of the Trunk Anti-Tromboning (TAT) feature is to optimizetromboned ISDN PRI trunks, ISDN Signaling Link (ISL), Virtual NetworkServices (VNS) trunks, or analog trunks within an ISDN PRI network.Anti-tromboning will be performed only after the third party answers, andprovided that the tromboned PRI/ISL/VNS or analog trunks are associatedwith the same primary D-channel (with or without a backup D-channel) andthe trunks are associated with the same customer. Anti-tromboning will notbe performed if the tromboning trunks belong to different customers on thesame node (even though they are associated with the same primaryD-channel.)
