The phones are capable of handling UTF-8 encoding and, depending on phone model, some degree of Unicode support.
Some phone models (such as the Cisco Unified IP Phones 7905, 7912, 7940, and 7960) can handle UTF-8 encoding, but will only
recognize characters which can be represented by the default encoding of the phone's current user locale. For example, if
the phone is currently configured to use the English_United_States locale, then it will only be able to display UTF-8 characters
which map to the ISO-8859-1 character set.
Other phone models (such as the Cisco Unified IP Phones 7911, 7941, 7961, 7970, and 7971) provide UTF-8 and true Unicode support.
These phones provide support for more multi-byte character sets and user locales like Japanese and Chinese.
Note
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The Cisco Unified IP Phones 7970G and 7971G-GE, and the Cisco Unified Wireless IP Phone 7921G are deprecated with Cisco Unified
Communications Manager 12.0(1) and later. The phones still work on previous versions of Cisco Unified Communications Manager.
The Cisco Unified IP Phones 7902, 7905, 7910, and 7912, and the Cisco Unified Wireless IP Phone 7920 are deprecated with Cisco
Unified Communications Manager 11.5(1) and later. The phones still work on previous versions of Cisco Unified Communications
Manager.
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In addition to the character set for the currently configured user locale, the phone models also support ISO-8859-1 characters
in their font files.
All phones advertise their supported encodings using the standard HTTP Accept-Charset header. According to the HTTP standard,
q-values are used to specify preferred encodings. The older phone models, with more limited UTF-8 support, specify a lower
q-value for UTF-8 than the default user locale encoding.
For example, an older phone model configured with the English_United_States user locale would include an Accept-Charset header
similar to the following:
Accept-Charset: iso-8859-1, utf-8;q=0.8
A newer phone model with Unicode support would advertise an Accept-Charset similar to the following:
Accept-Charset: utf-8,iso-8859-1;q=0.8