How is a slave belonging to the speaker called out?

The student: Like "abd" (slave).

The Shaykh : Because I want to call out a slave that is attached to me. If "abd" is alone, just by itself, and the alif of the call is added, it does not become a slave attached to me. If I say "Wa abdan" (O slave)...
The student: Is it permissible in the call to say "Ya abdu" (O slave)?

The Shaykh : Yes, it is permissible because the call does not end with an alif.
The student: ... the alif was deleted.

The Shaykh : Or a ya.
The student: The ya is a transformation of an alif.

The Shaykh : Yes.
The student: ...

The Shaykh : Yes, indeed.
The student: ...

The Shaykh : We know this because we said that the ya is deleted because the alif is brought for the call. If we deleted the alif, if we deleted the alif, it would not be correct.
The student: Which alif?

The Shaykh : The alif of the call.
The student: But we said "Wa abdan."

The Shaykh : Its original form is "abdi" (my slave).
The student: Yes.

The Shaykh : Did you understand or not? We say it is permissible to say "Wa abdan," "Wa abdan" with the alif.
The student: Yes.

The Shaykh : And it is permissible to say "Wa abdiya," "Wa abdiya" with the alif, clear? We moved the ya with a fathah to match the alif. Now, if we say "Wa abdan," it is because we deleted the ya due to the meeting of two static letters.
The student: ... in the call, "Wa abdan."

The Shaykh : What do you want?
The student: ... it is not known in the grammar.