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110
TAU-4M.IP Subscriber gateway
'Unattended calltransfer'
service allows to put an online subscriber (Subscriber А) on hold with a short
clearback flash and dial another subscriber's number (Subscriber С). Call will be transferred automatically when
Subscriber B finishes dialling the number.
Fig. shows an algorithm of
'Unattended calltransfer'
service operation.
'Local Calltransfer'
service allows to transfer the call within the gateway without external REFER message
sending in case when Subscriber C is local
TAU-4M.IP,
subscriber and call was made directly, without proxy
server. If subscriber C is external subscriber or local, but has been dialed using proxy server,
'Local Calltransfer'
service processing as
'Attended Calltransfer'
, ie call transfer is carried out by sending the REFER message to
subscriber B.