ALL TRANSFER
C
Blind Transfer
Assume that call party A and B are in
This function is applicable on FXS port for VoIP calls only.
conversation. A wants to Blind Transfer B to C:
1. A press FLASH on the analog phone to hear the dial tone.
2. Then A dials *87 then dials C’s number, and then #
3. A can hang up.
NOTE: “Enable Call Feature” has to be set to “Yes” in web configuration page.
Three situations can follow the transfer:
1. 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.
2. 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.
3. 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.
Attended Transfer
Assume that call party A and B are in
This function is applicable on FXS port for VoIP calls only.
conversation. A wants to Attend Transfer B to C:
1. A presses FLASH on the analog phone to get a dial tone
2. A then dial C’s number followed by #.
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.
Grandstream Networks, Inc. HT488 User Manual Page 11 of 31
Firmware 1.0.3.86 Last Updated: 7/2007
NOTE: When Attended Transfer fails and A hangs up, the HT503 will ring user A back again to remind
A that party B is still on the call. Party A can pick up the phone to resume a conversation with party B.