Call transfer causes

class UASCallChannel

class TransferCause

Calling any of the transfer functions results in one of these transfer causes being set.

Transfer causes:

NONE

no transfer cause is currently available, no transfer function has yet been called, or one has but hasn’t yet finished

NORMAL

the call was transferred successfully.

TIMEOUT

the transfer took longer than allowed to complete.

HANGUP

the call being transferred was hung up before transfer occurred.

TARGETREJECT

the transfer target rejected the call, for example it may have been busy.

TARGETHANGUP

the transfer target was hung up before transfer occurred.

FAIL

the transfer failed.

Usage example:

state = channel.retrievable_transfer(other_call, 'sip:3301@127.0.0.1:5060;user=phone')
if state != channel.State.TRANSFERRED:
    if channel.transfer_cause() == channel.TransferCause.HANGUP:
        print("could not transfer the call, the call has hung up")