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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP)
OL-20798-01
Chapter 1      An Overview of the Cisco Unified IP Phone
  Understanding Security Features for Cisco Unified IP Phones
Table 1-6 provides information about changes to conference security levels depending on the initiator’s 
phone security level, the security levels of participants, and the availability of secure conference bridges.
Table 1-6 Security Restrictions with Conference Calls 
Initiator’s Phone 
Security Level Feature Used
Security Level of 
Participants Results of Action
Non-secure  Conference Encrypted or authenticated Nonsecure conference bridge
Nonsecure conference 
Secure (encrypted or 
authenticated) 
Conference At least one member is 
non-secure
Secure conference bridge
Nonsecure conference
Secure (encrypted)  Conference All participants are 
encrypted
Secure conference bridge
Secure encrypted level conference
Secure (authenticated)  Conference All participants are 
encrypted or authenticated
Secure conference bridge
Secure authenticated level conference 
Non-secure  Conference Encrypted or authenticated Only secure conference bridge is available 
and used
Nonsecure conference 
Secure (encrypted or 
authenticated)
Conference Encrypted or authenticated Only non-secure conference bridge is available 
and used
Nonsecure conference
Secure (encrypted or 
authenticated)
Conference Secure or encrypted Conference remains secure
When one participant tries to Hold the call with 
MOH, the MOH does not play
Secure (encrypted)  Join Encrypted or authenticated Secure conference bridge
Conference remains secure (encrypted or 
authenticated)
Non-secure cBarge All participants are 
encrypted
Secure conference bridge
Conference changes to non-secure 
Non-secure  MeetMe Minimum security level is 
encrypted
Initiator receives message “Device Not 
Authorized”, call rejected.
Secure (encrypted) MeetMe Minimum security level is 
authenticated
Secure conference bridge 
Conference accepts encrypted and 
authenticated calls
Secure (encrypted) MeetMe Minimum security level is 
non-secure
Only secure conference bridge available 
and used
Conference accepts all calls