Specifications

Interoperability
Cisco TelePresence MCU 4.4(3.49) Maintenance Release Notes Page 16 of 27
PCS-G50 2.72 Tested H.323 and H.323 to SIP interworking.
n At low bandwidths this endpoint may not handle audio properly.
You can mitigate this by disabling AAC codec for this endpoint.
n The endpoint does not correctly signal a deliberate
disconnection, so the MCU treats it as an unexpected
disconnection and may redial if configured to redial on
unexpected disconnections.
PCS-XG80 2.36 Tested H.323 and SIP.
n An H.323 call to an encryption-required conference may result
in no video or delay in starting video.
n The MCU 5300 Series cannot use AAC-LC with this endpoint.
n When calling over SIP, this endpoint only supports the first audio
and video codecs that it advertises. If the MCU chooses a
different audio or video codec from the advertised set, the
endpoint may not be able to decode the audio or video from the
MCU.
n On H.323 calls the endpoint does not correctly signal a
deliberate disconnection, so the MCU treats it as an unexpected
disconnection and may redial if configured to redial on
unexpected disconnections.
Polycom endpoints
Equipment Software revision Comments
HDX 4500 3.0.3.1-19040 Tested H.323 and SIP.
n The Polycom HDX 4500 is unable to decode video or content
sent by the MCU in the aspect ratio 1600x1200. (CSCts46398 /
Polycom reference: VIDEO-90136)
n Using only Siren 14 audio codec with this endpoint is not
supported. However, if the MCU does not apply this restriction,
the parties will successfully interoperate using a different audio
codec.
n The endpoint is not capable of simultaneously sending H.263+
main video and H.264 content. All other codec combinations
work.
n H.261 video between MCU and this endpoint does not work
over SIP.
n The endpoint does not respond properly to commands to
mute/unmute audio/video from MCU. Using this feature with this
endpoint may lead to unexpected behavior.