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BudgeTone-100 User Manual Grandstream Networks, Inc.
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4.3.3 Answer an Incoming Call
There are two ways to answer an incoming call:
1. Pick up the handset to answer the call normally
2. Press the SPEAKERPHONE button to answer in speakerphone mode
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. 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 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.
Two 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: