Cisco Cisco TelePresence MCU 4510 Maintenance Manual

Advanced interoperability parameters

Field

Field Description

Usage Tips

Content
negotiation

This field allows the MCU
to be configured so that
content can be exchanged
with third party MCUs in
multi-level cascaded
conferences over H.323.
Choose from:

■

As master: The
MCU only acts as
master in H.239
token negotiation.

■

As slave: The MCU
acts as the slave in
H.239 token
negotiation and
can send content
to a master unit if it
accepts the token
request.

■

Mimic slave: The
MCU mimics a
slave during H.239
token negotiation,
but does not
actually act as a
slave. The MCU still
tries to send
content to all other
endpoints/units
even if the third
party MCU rejects
the token request.

When exchanging content with an endpoint in a H.323 call, the MCU
acts as a master unit and the endpoint as a slave unit for the purpose of
H.239 token negotiation. However, in order for the MCU to exchange
content with a cascaded third party MCU, the MCU must appear to the
third party MCU to be a slave unit. The MCU can be configured as a true
slave, in which case content will only be sent if the third party MCU
master accepts the token request, or to mimic a slave (content is sent to
all other connected endpoints even if the third party MCU rejects the
token request).

Note

: MCU to MCU SIP cascading is not supported. When doing SIP to

SIP cascading, the MCU's BFCP negotiation fails and the content
appears in the main video instead of a separate channel.

Custom
codec
selection

Can be used to ensure
only specific codecs are
permitted on calls to (and
received from) this
endpoint.

If Enabled, you can select which codecs are allowed to be used when
communicating with this endpoint. This setting overrides the MCU-wide
codec selection on the Settings > Conference page.