Symptom:
Jabber Guest 10.0.2.75 does TURN configuration does not always work with the default VCS Admin
Account.  This result in TURN error when browsing links:

Error when browsing links:
TURN Credential Error

Please confirm the Call Control and Media settings are correct.
Message: Failed to acquire TURN credentials
Category: 12 (TURN_CREDS_ACQUIRE_FAILED)
Code: 0

Creating a new user account on the VCS for use on Jabber guest turn configuration Corrects this issue.  This 
documentation defect is to update the install guide to require creating a new account.

Page 33 - Configure TURN Credential Provisioning, STEP 7
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/Guest/10_0/icg/JABC_BK_J0FC634A_00_jabberc-installation-and-configuration-guide.pdf

NOTE: This does not occur in all deployment, however, when it does occur, new user account correct the issue.

Conditions:
Using VCS Default admin account on Jabber Guest server for TURN Configuration

Jabber Guest documentation has been updated for Cisco Jabber Guest 10.5(1) and later.