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Appendix A: Disconnection Causes
A-2
Security Failure Remote device
capabilities do not
support encryption
The endpoint failed to
encrypt. (ISDN)
A common key
exchange algorithm
could not be established
between the MCU and
the remote device
The endpoint does not
support the local
encryption key
exchange algorithm.
Remote device did not
open the encryption
signaling channel
The endpoint did not
open the encryption
signaling channel.
Remote device key
exchange algorithm
message was not
received by the MCU
The MCU did not
receive the remote
encryption algorithm
capabilities from the
endpoint.
The encryption setup
process did not end on
time
The encryption setup
process did not end on
time.
Remote device cannot
encrypt
The endpoint failed to
encrypt. (ISDN)
The remote device failed
to start encryption
system
The endpoint failed to
start the encryption
system. (ISDN)
The remote devices'
selected encryption
algorithm does not
match the local selected
encryption algorithm
The encryption
algorithm selected by
the endpoint does not
match the MCU's
encryption algorithm.
(ISDN and IP)
Encryption key
exchange failed
Encryption key
exchange failed. (ISDN)
Table A-1: Primary Disconnection Reasons (Continued)
Category Cause Message Description