[VIP-251T] How to transfer the current talking call to another user?

There are 2 ways for call transfer function, please refer to the below detail descriptions.

A.Blind Transfer
1.B call to A and they are in the process of conversation.
2.A press "Transfer" button to hold the conversation with B, and input the number of C (Follow by the "#" key).
3.C will ring up, and A hang up the handset.
4.C picks up the handset and conversation with B.

B.Attendant Transfer
1.B call to A and they are in the process of conversation.
2.A press "HOLD" button to hold the conversation with B, and input the number of C (Follow by the "#" key).
3.C will ring up.
4.C picks up the handset and conversation with A.
5.A press "Transfer" button and hang up, then C will converse with B.