Grandstream Networks, Inc. HT-502 User Manual Page 12 of 31
Firmware 1.0.0.29 Last Updated: 01/2007
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 GXW 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
Bellcore Style 3-way Conference
The HT–502 supports Bellcore Style 3-way Conference only.
Directions for using 3-Way Conferencing:
1. Caller A presses “flash” to receive a dial tone. (Hook Flash for older model phones).
2. Caller A dials Caller C’s number then # (or wait for 4 seconds).
3. If Caller C answers call, then Caller A presses “flash” to bring Parties B & C into conference.
4. If Caller C does not answer the call, Caller A can press “flash” to resume call with Caller B.