att.ascribed.directed provides attributes for elements representing speech or action that can be directed at a group or individual. [3.3.3 Quotation 8.3 Elements Unique to Spoken Texts]
Moduletei — The TEI Infrastructure
Memberskinesic move pause q said sp spGrp stage u vocal writing
Attributesatt.ascribed (@who)
toWhomindicates the person, or group of people, to whom a speech act or action is directed.
Status Optional
Datatype 1–∞ occurrences of teidata.pointer separated by whitespace

In the following example from Mary Pix's The False Friend, speeches (sp) in the body of the play are linked to castItem elements in the castList using the toWhom attribute, which is used to specify who the speech is directed to. Additionally, the stage includes toWhom to indicate the directionality of the action.

<castItem type="role">
 <role xml:id="emil">Emilius.</role>
<castItem type="role">
 <role xml:id="lov">Lovisa</role>
<castItem type="role">
 <role xml:id="serv">A servant</role>
<!-- ... -->
<sp who="#emiltoWhom="#lov">
 <l n="1">My love!</l>
<sp who="#lovtoWhom="#emil">
 <l n="2">I have no Witness of my Noble Birth</l>
 <stage who="emiltoWhom="#serv">Pointing to her Woman.</stage>
 <l>But that poor helpless wretch——</l>

To indicate the recipient of written correspondence, use the elements used in section 2.4.6 Correspondence Description, rather than a toWhom attribute.