BudgeTone-100 User Manual
Grandstream Networks, Inc.
4.3.4 Handset Mode and Speakerphone Mode
Handset mode and Speakerphone mode cannot be enabled at the same time. Pressing the
hook-switch or Speakerphone button would toggle the phone between these two modes.
4.3.5 Call
Hold
While in conversation, pressing the “Hold” button will put the remote end on hold. This
is achieved by sending a Re-INVITE with “a=sendonly” attribute and a zero IP address
for media in the SDP message. Pressing the “Hold” button again will release the
previously Hold state and the bi-directional media will resume again. This is triggered
by sending another Re-INVITE with “a=sendrecv” attribute and a non-zero IP address
for media in the SDP message.
4.3.6 Flash
This button is basically equivalent to putting an active call on Hold and then switching
to the other voice channel. If the other channel has an active conversation going on, this
is essentially a switching of the “talking” channel and the other channel will be
activated. If the other channel is idle with no active conversation going on, then the user
will hear a dial tone.
4.3.7 Call
Transfer
The user can transfer an active call to a third phone by using the “Transfer” button. The
sequence is like this:
The user presses the “Transfer” button and if the other voice channel is
available (i.e., there is no other active conversation besides the current one),
he/she will hear a dial tone. He/She can then dial the 3
rd
phone and then
hangs up his own phone.
2 kinds of blind call transfers are supported: using REFER and using BYE/Also:.
The SIP message flow based on SIP REGER method looks something like this:
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