14
Features
functions without an additional Media Gateway card. The system software
provides up to 32 uncompressed VoIP gateway channels without echo
compensation.
For users wanting to use PC-supported telephony, IP system terminals are
available as separate licensable software versions (“Softphone”). You will find
further information on this in the chapter on
VoIP with media gateway card
Additional VoIP features can be used by installing a media gateway card with
the communications system Forum 523/524.
●
SIP (internal)
: You can operate SIP system phones Forum IPhone 512 /
Forum IPhone 545 and standard SIP telephones.
●
SIP (external)
: You can use external SIP connections as “SIP trunk lines”.
Setting up and using external SIP connections is completely transparent
for telephone users, providing them with easy access to low-cost Internet
telephony and a fallback to normal ISDN connections in case of error or
busy lines. A Media Gateway card is required for SIP telephony.
●
Q.SIG-IP
and
SIP tie line
: Several communications systems can be
networked via IP connections using “Q.SIG IP”. Low-cost data connections
can be used to network the communications systems of branch offices
instead of ordinary permanent ISDN lines.
●
DECT over IP
®
: DECT networking via VoIP is another possible option for
offices already extensively using VoIP telephony. The Radio Fixed Parts
(RFPs) are connected via network data connections, so they do not occupy
any U
pn
ports and can use existing network connections. With
DECTover IP, VoIP protocol data is changed into DECT-compatible voice
data direct on the RFPs. DECT-RFPs and DECTover IP-RFP can be used
together in combination in many cases; it is however not possible to switch
between RFPs using different technologies during a call.
Packet Data in the D Channel
Some business applications, for instance POS terminals, cash registers or
credit card terminals, require a permanent data connection over the X.25
packet data network. Packet data transfer through the ISDN D channel
(according to X.31 via SAPI 16) can also be established between several S
0
interfaces of the Forum 523/524. Simultaneous connections are distin-
guished by means of a TEI (Terminal Endpoint Identifier).
Summary of Contents for forum 523
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