IP Network Connections
138
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 systems via
network connections: Q.SIG-IP and SIP tie line. The various features of these
protocols are summarised in the following table:
Connection via Q.SIG.IP
The Forum 523/524 communications system supports transmission 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 connec-
tions 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 connection is simulated for each Q.SIG-IP
bundle. This means that 5 virtual D channels and up to 120 voice channels are
available. The Media Gateway Card channels are used for Q.SIG-IP (see
starting on page 100). Q.SIG-IP connection data are subject to
codec compression (please refer to
chapter regarding
starting on page 92). Q.SIG-IP also transfers the voice data
directly from terminal to terminal via the RTP protocol. In certain cases, for
example, when an incoming external call is placed via multiple TK systems,
one or more RTP proxies may be used to forward the connection.
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
yes
transparent codec interconnection
no
yes
automatic feature detection
no
yes
