locally. The Cisco VXC 2100 series attaches to the Cisco Unified IP Phone 8961, 9951, and 9971 through a
spine connector cable.
When running VXC with a single-tunnel option, high traffic to or from VXC may affect the phone's
performance. Cisco Unified IP Phones 8961, 9951 and 9971 support 384kbps throughput bandwidth for VXC.
Set VPN MTU to 1406 to reduce packet reassemble in Cisco Unified IP Phones 8961, 9951 and 9971, to
improve bandwidth in limited packet rate.
Video and audio applications may not play smoothly through VXC, even on a device plugged directly into a
LAN.
USB CD-ROMs and other USB storage devices have limited support. In the current VXC environment, the
expected performance is a low bit/transfer rate for USB storage devices and USB CD-ROMs connected to
the VXC device.
For more information, see http://www.cisco.com/en/US/products/ps11499/tsd_products_support_series_
home.html.
Multiple Text Messages
If you send multiple text messages to 8961, 9951, and 9971 phones within a few seconds using
CiscoIPPhoneExecute.xml, the phone may reply with an HTTP/1.1 503 Service Unavailable message, and
the user may not receive the text message on their phone screen.
No UDP for SIP support
Cisco Unified IP Phones 8961, 9951, and 9971 do not support UDP for SIP. Do not configure the UDP protocol
for SIP signaling on 8961, 9951, and 9971 phones.
Secure Video Bandwidth When Calling Over VPN
When using Cisco Unified IP Phones 8961, 9951, and 9971 for a secure video call over VPN and VXC VPN,
the maximum supported bandwidth is 320 kbps.
Turn Off VPN Before Downgrade
The phone will go into an unregistered state if it is downgraded from a 9.3(1) load to a pre-9.2(3) load while
VPN is turned on. Turn off VPN before downgrading to a pre-9.2(3) load.
Firmware update timing
If a firmware update occurs while phones are in use, users may experience problems with their phone, such
as:
•
calls drop during a transfer
•
calls drop during conference set up
Cisco Unified IP Phone 8961, 9951, and 9971 Release Notes for Firmware Release 9.3(2)SR1
6
Cisco Unified IP Phone 8961, 9951, and 9971 Release Notes for Firmware Release 9.3(2)SR1
Multiple Text Messages
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