Symptom:
The Cisco TelePresence MCU 45X0, 53X0 and MCU MSE 8510 Deployment Guide 4.4" should indicate that it is not possible to configure the "MCU as a Unified CM media resource" and the "MCU as a trunk for Rendezvous conferencing" at the same time directly as it may seem to suggest, without the use of another device such as "Telepresence Conductor". This is due to a limitation on SIP trunk provisioning on CUCM and the MCU.

The documentation should state configuring both of these features at the same time, without "Conductor" is not possible.

Conditions:
Attempting to configure both  MCU as a Unified CM media resource" and "MCU as a trunk for Rendezvous conferencing"