Exam 350-801 topic 1 question 127 discussion

A Trusted Relay Point (TRP) is an MTP or transcoder that Cisco Unified Communications Manager can insert into the media stream to act as a control point for call media. The TRP can provide further processing on the stream and can ensure that the stream follows a specific path.

A Trusted Relay Point (TRP) is a device that can be inserted into a media stream to act as a control point for that stream. It may be used to provide further processing on that stream or as a method to ensure that the stream follows a specific path. If the signaling and media take different paths, a UDP pinhole is not opened. The solution might be a TRP. Subscribers in each data center can invoke TRPs that provide anchoring of the media and ensure that the media streams flow through the appropriate firewall. The TRP provides an IP address that enables a specific host route for media that can ensure the same routing path as the call signaling. Implementing Cisco IP Telephony and Video, Part 1 (CIPTV1) Foundation Learning Guide

Answer is A https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_0_1/systemConfig/cucm_b_system-configuration-guide-1201/cucm_b_system-configuration-guide-1201_chapter_0111011.html