Intel 05-2409-003 Manual Do Utilizador

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Global Call API for HMP on Windows Programming Guide — August 2006

Using Global Call to Implement Call Transfer

Figure 34. Blind Call Transfer (Unsupervised Transfer)

11.1.2

Supervised Call Transfer

In a supervised call transfer scenario, party A transfers the call between A and B (Call 1) to a call
between party B and C after establishing a consultation call with party C. In this call, party A
informs Transferred-to party C of the intent of transferring party B to party C and collects the
feedback and rerouting address from party C. Party A requests that party B dial party C’s address
(rerouting address) and then disconnect from Calls 1 and 2 after Call 3 (Transferred-to call)
between party B and party C has been established.

Before call transfer can occur, party A must be in a call with party B (Primary Call, Call 1).

Figure 35. Supervised Call Transfer

11.2

Call Transfer State Machine

Table 14 lists the new Global Call call states for blind call transfer.

Transferred_
To_Party (C)

Transferring

Party (A)

Transferred

Party (B)

Call 1

Before Blind Transfer

Transferring

Party (A)

Transferred

Party (B)

Transferred_
To_Party (C)

Call 1

Call 2

Transferring

Party (A)

Transferred

Party (B)

Call 2

Blind Call Transfer

After Blind Transfer

Transferred_
To_Party (C)

Transferring

Party (A)

Transferred

Party (B)

Call 1

Before Transfer

Transferring

Party (A)

Transferred

Party (B)

Transferred_
To_Party (C)

Call 1

Call 2

Transferring

Party (A)

Transferred

Party (B)

Call 3

Call 2 Setup

Call 3 Setup

Transferred_
To_Party (C)

Call 1

Call 2

Transferred

Party (B)

Call 3

After Call Transfer

Transferred_
To_Party (C)

Transferring

Party (A)