Polycom RealPresence RMX 1500 Administrator's Manual page 554

Supported Capabilities and Conferencing Features:
● ISDN video is supported only in Continuous Presence (CP) conferences.
● Only BONDING (using multiple channels as a single, large bandwidth channel) is supported.
● Simple audio negotiation.
● Supported video resolutions are the same as for IP.
● Supported video Protocols are the same as for IP: H.261, H.263, H.264.
● H.239 for content sharing.
● Lecture Mode.
● DTMF codes.
● Securing of conferences.
● Basic cascading between two MCUs using an ISDN link is available and forwarding of DTMF codes
can be suppressed.
Non Supported Capabilities and Conferencing Features:
● NFAS (Non-Facility Associated Signaling)
● Leased line usage
● Restricted Channel mode
● Aggregation of channels
● E1 and T1 spans cannot operate simultaneously
● V.35 serial standards
● Primary and secondary clock source configuration (they are automatically selected by the system)
● Auto detection of Audio Only setting at endpoint
● Auto re-negotiation of bit rate
● Additional network services (two currently supported)
● Change of video mode (capabilities) from remote side during call
● Audio algorithms G.729 and G.723.1
● FECC
● H.243 Chair Control
● T.120 data sharing protocol
● H.261 Annex D
● MIH Cascading using an ISDN connection as cascade link
Polycom®, Inc.
Defining ISDN/PSTN Network Services
523