BELGACOM Forum 526, Руководство по монтажу и пусконаладке, Страница: 152 / 232

IP Network Connections 150
PBX Networking
IP Network Connections
If you are operating a fast and continuous network or internet
connection at two or more sites, you can also network the PBX
systems via a network connection.
There are two different protocols available for networking TC sys-
tems via network connections: Q.SIG-IP and SIP tie line. The vari-
ous features of these protocols are summarised in the following
table:
Connection via Q.SIG.IP
The Forum 525/526 communications system supports transmis-
sion of the Q.SIG protocol – intended for ISDN point-to-point
connections – via network connection (Q.SIG-IP). Protocol and
call data are exchanged using IP connections with Q.SIG-IP.
The number of simultaneous conversations possible will depend
on the capacity of the network or internet connection and the
compression method used. A multiple S
2M
point-to-point connec-
tion is simulated for each Q.SIG-IP bundle. This means that 5 vir-
tual D channels and up to 120 voice channels are available. The
Media Gateway Card channels are used for Q.SIG-IP (see
MGW
Interface Card starting on page 104). Q.SIG-IP connection data
are subject to codec compression (please refer to Voice over IP
(VoIP) chapter regarding Fundamentals starting on page 95).
Q.SIG-IP also transfers the voice data directly from terminal to
terminal via the RTP protocol. In certain cases, for example, when
TC system networking via network connections
Feature Q.SIG-IP SIP
tie line
Establishing a call (“basic call”) with
call-number transmission yes yes
name information transmission yes yes
single number dial possible yes no
transparent codec interconnection no yes
automatic feature detection no yes