Release Notes

Limitations
Cisco TelePresence Server Software Release Notes 3.1(1.95) Page 17 of 31
Resource optimization causes brief video interruptions
When TelePresence Conductor optimizes the resources used for a call, that endpoint's video contribution is
very briefly interrupted. This can be visible to others as a flicker of black in the otherwise continuous stream.
Issue identifier CSCuj53830.
Call transfer is disabled
The TelePresence Server does not support call transfer.
DTLS and custom certificates
DTLS is used to negotiate encryption parameters with TIP endpoints. This requires a certificate to be used.
There are some limitations when using DTLS with customer-supplied certificates:
n Opportunistic DTLS, as supported in release 2.2, always uses the default certificate for DTLS negotiation,
even if a customer-supplied certificate is uploaded. This is due to technical limitations.
n Release 2.3 and later supports a new improved DTLS type — ‘negotiated DTLS’. When using ‘negotiated
DTLS’, the TelePresence Server uses the customer-supplied certificate if they have uploaded one (which
is the preferred procedure). If ‘negotiated DTLS’ is used in a call to a CTS endpoint combined with some
custom certificates, DTLS may fail on these calls. This is due to defect CSCts24503. The call may still
connect but without encryption. As a workaround, use a smaller custom certificate such as a certificate
with a 1024 byte key or use the default certificate on the TelePresence Server.
HD quality indicators on CTS endpoints
The lobby screen is a static image that is designed for HD mode, that is, 720 pixels high. When a CTS
endpoint displays the lobby screen, it may go on to incorrectly report the quality of the received video stream.
The quality indicator may show four bars – for 720p video – even though the endpoint is actually receiving
1080p video and should display five bars.
Encryption required causes issues with some endpoints
Some endpoints such as the Sony XG-80 and HG-90, and the TANDBERG Classic 6000s are unable to join
conferences in which encryption is required, even when encryption is enabled on the endpoint. (TANDBERG
is now part of Cisco.)
Setting these conferences to have optional encryption allows these endpoints to join using encryption.
Clustering limitations
Slot 10 of the Cisco TelePresence MSE 8000 chassis does not support clustering in this TelePresence
Server software release. However, slot 10 in the same chassis as a cluster can be used for a standalone
blade of any type.
Calls from Microsoft Lync which do not use Advanced Media Gateway
may fail
For direct calls from Microsoft Lync or OCS you must use the VCS B2BUA. Calls may no longer work if
configured through a VCS zone with profile "Microsoft Office Communication Server". For more information
on configuring the VCS, refer to the VCS Administrator documentation.