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Figure 2: SMS at No Answer Function
Fig. 2 shows sending of information texts if an incoming call is not answered.
Subscriber A calls subscriber B, for whom the
has been
2N Mobility Extension
®
permitted with activated “Follow me” and “SMS at no answer” services. Subscriber B
does not answer the call in the VoIP network and so the call is rerouted to its mobile
telephone. Subscriber B does not answer the mobile phone call and is sent a text
announcing that the call from subscriber A has been missed.
"Call forwarding" function
In addition to rerouting calls in the event of absence, the
2N Mobility Extension
®
allows calls to be forwarded within a VoIP network, which brings the services of the
SIP Proxy to a mobile telephone. The description of this function is shown in Fig. 3.
Figure 3: Call Forwarding Function
In Fig. 3 subscriber A is talking to subscriber B, for whom the
2N Mobility Extension
®
has been permitted. Subscriber A would like to be forwarded to subscriber C. For this
reason, subscriber B holds the call with A (7* in the default setting ), dials the number
of subscriber C, terminates dialling with the dialling end character (# in the default
setting), notifies subscriber C of the call to be forwarded and hangs up to forward the
call. If subscriber C does not want to talk to subscriber A, subscriber B terminates the
call with C (9# in the default setting) and returns to the call with A.
"Quick call forwarding" function
In Fig. 4 subscriber A is talking to subscriber B, for whom the
2N Mobility Extension
®
has been permitted. Subscriber A would like to be forwarded to subscriber C.
Subscriber B wants to forward the call without having to talk to subscriber C. So
