vcard_field
Description:
The most common vCard field used for this protocol's contact identifiers, normalized to lower case, or null if there is no such
field or the TP_PROTOCOL_FEATURE_CORE feature has not been prepared.
The most common vCard field used for this protocol's contact identifiers, normalized to lower case, or null if there is no such
field or the TP_PROTOCOL_FEATURE_CORE feature has not been prepared.