Grandstream Networks, Inc. |
5.2.5Call Transfer
5.2.5.1 Blind Transfer
Assuming that call party A and B are in conversation. A wants to Blind Transfer B to C:
1.A presses “FLASH” on the analog phone ( or Hook Flash for old model phones) to get a dial tone.
2.A dials *87 followed by C’s number, then #(or wait for 4 seconds)
3.A can hang up.
NOTE: “Enable Call Feature” has to be set to “Yes” in web configuration page.
A can hold on to the phone and wait for one of the three following behaviors:
•A quick confirmation tone (temporarily using the call waiting indication tone) followed by a dial tone. This indicates the transfer is successful (transferee has received a 200 OK from transfer target). At this point, A can either hang up or make another call.
•A quick busy tone followed by a restored call (on supported platforms only). This means the transferee has received a 4xx response for the INVITE and we will try to recover the call. The busy tone is just to indicate to the transferor that the transfer has failed.
•Busy tone keeps playing. This means we have failed to receive the second NOTIFY from the transferee and decided to time out. Note: this does not indicate the transfer has been successful, nor does it indicate the transfer has failed. When transferee is a client that does not support the second NOTIFY (such as our own earlier firmware), this will be the case. In bad network scenarios, this could also happen, although the transfer may have been completed successfully.
5.2.5.2 Attended Transfer
Assuming that call party A and B are in conversation. A wants to Attend Transfer B to C:
1.A presses “FLASH” on the analog phone (or Hook Flash for old model phones) to get a dial tone
2.A then dial C’s number followed by # (or wait for 4 seconds).
3.If C answers the call, A and C are in conversation. Then A can hang up to complete transfer.
4.If C does not answer the call, A can press “FLASH” back to talk to B.
NOTE:
•When Attended Transfer failed and A hang up, HandyTone- 486 will ring user A back again to remind A that B is still on the call. A can pick up the phone to restore conversation with B.
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