Grandstream Networks GHP6 Series - Attended Transfer; 3-Way Conferencing; Hunting Group

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.
3-Way Conferencing
The GXW42XX supports Bellcore style 3-way Conference.
Instructions for 3-way conference:
Assuming that call party A and B are in conversation. A (GXW42XX) wants to bring C in a conference:
1. A presses FLASH (on the analog phone, or Hook Flash for old model phones) to get a dial tone.
2. A dials C’s number then # (or wait for 4 seconds).
3. If C answers the call, then A presses FLASH to bring B, C in the conference.
4. If C does not answer the call, A can press FLASH back to talk to B.
5. If A presses FLASH during conference, C will be dropped out.
6. If A hangs up, the conference will be terminated or transfer B to C if “Transfer on Conference Hangup” set to yes
Hunting Group
This feature allows the user to setup a single SIP account on the gateway and have the ability to use all FXS ports to
make/receive calls. Using this feature, all ports active in same Hunting Group will have the same phone number and incoming
calls will be distributed in a Linear or Circular manner among the ports active in that Hunting Group. The number of hunting
groups is limited by the number of ports each GXW model has – i.e. each port can be its own Hunting Group. The most
practical and efficient way to use Hunting Groups is to assign 2 or 3 ports to separate Hunting Groups.
One additional and popular way to use the Hunting Group feature is called “multiplexed analog lines”. In this configuration, a
legacy PBX system with 8 FXO trunks can be connected to 8 GXW 42xxports configured as a Hunting Group. The GXW can be
registered to a SIP server provider using only one phone number. If the SIP service provider allows multiple calls to the same
number, the GXW will allow 8 concurrent calls to the same SIP number. All office members can be reached remotely using the
same phone number in a round-robin fashion.
Example Configuration of a typical Hunting Group:
1. Configure the SIP account from your VoIP Service Provider on FXS port 1 under FXS Ports webpage.
When Attended Transfer fails and A hangs up, the GXW42XX 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.