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SIP Telephony
168
Voice over IP (VoIP)
page
.
Activate “SIP phones”. Please also note the corresponding information
in the “Forum 500 / Forum 5000 – Standard Terminals” user guide.
Alongside code number procedures, SIP subscribers can also use a series of
functional features realized via the SIP protocol. The Forum 5004/5008/
5012 is the ending for all SIP connections as opposed to what is usually the
case on the Internet. This enables SIP subscribers to use Forum 5004/5008/
5012 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-
party 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 acti-
vated on a SIP telephone or in the SIP
software.
Содержание Forum 500 Series
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