I have now tested a (previously suggested) method for doing supervised transfers using the Grandstream SIP phone. It isn't perfect, but it works and is very functional. Here are the steps:

1) A call comes in that you want to transfer

2) Flash once. This switches to the 2nd line and puts the caller on hold.

3) Call the party to which you want to transfer the call.

4) Arrange the transfer and have the person to which the call is being transferred hang up. Incidentally, while it may be obvious, it is still worth mentioning that before they hang up, you can switch back and forth between the two parties an indefinate number of times.

5) WITHOUT HANGING UP, press the flash button again. This switches you back to the caller.

6) Inform them of the transfer.

7) Press the transfer button and enter the transfer phone number. (This starts a simple blind transfer).

8) Hang up to complete the blind transfer.

Relative to a true supervised transfer, the only things I believe to be missing are the inability to transfer the call while the desired recipient is on the line, and the ability to pick the call back up if the transfer fails - and these may be major problems for some applications. However, it comes close enough for many purposes.

For reference, I'm using a slightly modified version of the stdexten macro in the dialplan (no t or T) and either SIP INFO or INBAND on the phones.

Stephen R. Besch


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