View source for CTIP and VoIP integration

=Conditions=
CTIP signaling for VOIP subscriber (ver. 1) includes some limitations.
After switching on CTIP signaling for VoIP subscriber ('''Subscribers/Special settings''' Field: ''Access levels to CTI transmission''), only one call can be established from VoIP (SIP, IAX) account - only one VoIP channels can be seized, it means:
::* while busyness of subscriber there is no possibility to establish second call with this subscriber;
::* subscriber is not authorized to establish second outgoing call;
::* while established call there is possibility to hold interlocutor without transferring him/her.

=Using Slican TelefonCTI application=
VoIP phone signaling forces some rules of behaviour:
* Lifting handset (empty SETUP frame) can be simulated by dialing '''**''' '', it enables to dial number by TelefonCTI application. 
* How to establish call using application ('''TelefonCTI'''):
:# user dials required number (or selects it from phone book) in TelefonCTI application window
:# confirms it (ENTER)
:# in application window, request fo lifting handset will be displayed
* VoIP client (Softphone, gateway, VoIP Phone)
:* User dial '''**''' on VoIP phone

Notices for developers concerning protocol: 
* In history of dialed numbers for VoIP phone there is no proper number (** is stored).
* There is no possibility to generate FLASH via CTIP protocol (locked).
* There is no possibility to lift or hang off the handset (as analogue phone) 
* Status of lifted handset (STAT) is generated when:
:# incoming call is answered,
:# outgoing call is generated. 
* Status of hanged off handset (STAT) is generated when VoIP channel becomes free.
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