When you upgrade a Cisco SPA50X or Cisco SPA30X IP phone, if you have installed a firmware version before 7.5.2b, you must first upgrade to 7.5.2b before you upgrade to release 7.5.3 or to a later release. See the following table for more information.
Firmware Release Installed on Your Phone
Special Instructions for Upgrade to Release 7.5.3 or Later
Upgrade to 7.5.2b first, then upgrade to 7.5.3 or later.
Upgrade Rule Workaround
If you upgrade using an upgrade rule, the following example can be used to upgrade successfully:
The Custom CA feature is not supported in this release.
The Secure Call feature is not supported in this release.
If the font size is 12, then the Hebrew character will be cut off from the top.
Note The phone does not support font size, 12 for Hebrew language.
Missing an option to add ”+” sign in the numeric input for PAB number entry.
The SPA phones do not support Xuser and Xpassword.
The SPA50x does not re-send another Subscribe for BLF if no Notify is received.
The SPA5x5 phone displays the CFWD softkey for other call states (dialing) even if the CFWD service is disabled.
The SPA5x5/51x phone XML Dictionary is missing the string, “Blind transfer number”
Call Pick on KEMS works only for he first registered SIP line on the SPA5x5 phone.
Custom CA still available on test build 7.5.6(XU001).
SPA50x/51x Phone freezes when making a call, if enabled DNS SRV and Auto Registration.
Behavior During Times of Network Congestion
Anything that degrades network performance can affect voice and video quality, and in some cases, can cause a call to drop. Sources of network degradation can include, but are not limited to, the following activities:
Administrative tasks, such as an internal port scan or security scan
Attacks that occur on your network, such as a Denial of Service attack
To reduce or eliminate any adverse effects to the devices, schedule administrative network tasks during a time when the devices are not being used or exclude the devices from testing.
Documentation, Service Requests, and Additional Information
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.