Defining ISDN/PSTN Network Services

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.

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Polycom 1500/1800/2000/4000 manual Supported Capabilities and Conferencing Features