3-Way Conferencing - Grandstream Networks DUAL FXS PORT HT502 User Manual

4. Caller A dials *87 then dials caller C's number, and then # (or wait for 4 seconds)
5. Caller A will hear the confirm tone. Then, A can hang up.
NOTE: "Enable Call Feature" must be set to "Yes" in web configuration page.
Caller A can place a call on hold and wait for one of three situations:
1. A quick confirmation tone (similar to call waiting tone) followed by a dial-tone. This indicates the
transfer is successful (transferee has received a 200 OK from transfer target). At this point, Caller
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. Continuous busy tone. The phone has timed out.
Note: continuous busy tone does not indicate the transfer has been successful, nor does it indicate
the transfer has failed. It often means there was a failure to receive second NOTIFY – check firmware
for most recent release.
Attended Transfer
Assume that Caller A and B are in conversation. Caller A wants to Attend Transfer B to C:
1. Caller A presses FLASH on the analog phone for dial tone.
2. Caller A then dials Caller C's number followed by # (or wait for 4 seconds).
3. If Caller C answers the call, Caller A and Caller C are in conversation. Then A can hang up to
complete transfer.
4. If Caller C does not answer the call, Caller A can press "flash" to resume call with Caller B.
NOTE: When Attended Transfer fails and A hangs up, the HT502 will ring back user A to remind A that B is
still on the call. A can pick up the phone to resume conversation with B.

3-WAY CONFERENCING

The HT502 supports Bellcore style 3-way Conference.
Instructions for 3-way conference:
FIRMWARE VERSION 1.0.6.8 HT502 USER MANUAL Page 19 of 50