Release Notes

Interoperability
Cisco TelePresence MCU 5300 Series 4.3(2.30) Software release notes Page 7 of 15
Polycom endpoints
Equipment
Version
Results
Polycom HDX 4500
3.0.3.1-19040
Tested H.323 and SIP.
 The Polycom HDX 4500 is unable to decode video or
content sent by the MCU in aspect ratios of 1600x1200
and 800x600. (CSCts46398 / Polycom reference:
VIDEO-90136)
 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.
 Using only H.263 with this endpoint is not supported.
However, if the MCU does not apply this restriction, the
parties will successfully negotiate H.263+ or H.264
instead.
 When a content stream's codec changes during a
conference, for example, when the provider or
resolution changes, the endpoint stops displaying the
content stream. (CSCtw49873)
 The endpoint is not capable of simultaneously sending
H.263+ main video and H.264 content. All other codec
combinations work.
 Delay in opening audio channel to MCU can result in
early part of voice prompt not being heard at the
endpoint.(CSCtz01271)
 MCU does not support sending 60fps to this endpoint.
(CSCtz12643)
Polycom ViewStation
SP
7.5.4
Tested H.323 and H.323 to SIP interworking. No issues found.
Polycom QDX 6000
4.0.2
Tested H.323 and SIP.
 H.323 to SIP interworking is not supported.
 Video artifacts may be visible in calls using H.261
codec .
Polycom VVX 1500
3.2.2.0481
Tested H.323 and SIP.
 Due to inaccurate timestamps sent by this endpoint, lip
synchronization cannot be guaranteed.
 In some circumstances this endpoint can fail to display
video during SIP calls.
 On low bandwidth H.323 calls, the endpoint may not be
able to decode audio.