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Voice over IP (VoIP)
SIP Telephony
Alongside code number procedures, SIP subscribers can also use a series of functional features realized via
the SIP protocol. The Comfort Pro S is the ending for all SIP connections as opposed to what is usually the
case on the Internet. This enables SIP subscribers to use Comfort Pro S features. Direct data exchange is thus
not possible between two SIP subscribers. The following table shows the possible features.
Features
Notes
Incoming and outgoing calls with call number display
(CLIP)
A SIP telephone requires a call number display for
CLIP.
Parallel connection of multiple SIP subscribers
SIP subscribers must be logged on under the same
user identification.
Enquiry, toggling, call waiting, three-way conference,
reject
Operation or feature must be available on the SIP
telephone or in the SIP software.
Call transfer
before and during a call; operation must be available.
Blind Transfer
SIP only: forwarding an incoming call without
accepting the call; feature must be supported by SIP
telephone or by the SIP software.
Keypad as “INFO” message
DTMF tones cannot be securely transferred “in band”
via compression codecs. Digital “out band”
transferral as “INFO” SIP message or via RFC 2833/
4733 is supported. This feature must be available
and activated on a SIP telephone or in the SIP
software.
Содержание Comfort Pro S
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