TB30s SIP Administrator Guide v1.3 Page 149 of 259
Blind Transfer
When the user initiates a blind transfer, the phone launches a “recovery
timer”. This timer ends if the 2nd correspondent answers and transfer is
then completed or if first dialog is recovered due to failure in the transfer or
timer expiration.
During this timer, in current implementation the transfer is not able to
answer to any incoming call, which is not a desirable behaviour in many
environments.
When an incoming call arrives, it is automatically placed on the first
available line. If the user press “C” key, an early BYE shall be sent to end
the dialog with the 1st correspondent.
Now, the early BYE must be sent only after the transferee has accepted the
REFER to avoid to cancel the on-going transfer.
Doing that, it is assumed there‟s no way to recover the 1st call if, for any
reason, the transfer fails.
The display will show the incoming call screen. Then the user can answer to
the 2nd call
See example below: