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PBX Networking Types of Point-to-Point Connections
Connection via the Public Network
Point-to-point connections via the public network of a network operator can be used for bridging distances
beyond 50 km. Due to the long distance involved, for technical reasons it is not possible to synchronise the L2
protocol. Consequently, the public network is normally the protocol master for protocol layers L1 and L2. One
PBX is therefore the L3 master and the other PBX the L3 slave.
Point-to-point connection via a public network
Connection via Q.SIG.IP
If you are operating a fast and continuous internet connection at two or more locations, you can establish the
TK system networking via internet connection as well. The Comfort Pro S uses the Q.SIG protocol, for use with
ISDN point-to-point connections and transports the protocol and voice data via IP connections.
The number of simultaneous conversations possible will depend on the capacity of the 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. Both Media Gateway
Card channels and the Media Gateway software function can be used for Q.SIG-IP.
Q.SIG-IP connection data are subject to codec compression (please refer to Voice over IP (VoIP) chapter
regarding Fundamentals starting on page 91). 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 mul-
tiple TK systems, one or more RTP proxies may be used to forward the connection.
Currently, there are no standards for the necessary extensions to the Q.SIG protocol. This means that you can
only use Q.SIG-IP between Comfort Pro S systems.
Networking two Comfort Pro S systems using Q.SIG-IP requires 2 licences – one licence per system. The
number of possible voice connections is not restricted by the licence.
PBX 1
L1 slave
L2 slave
L3 master
PBX 2
L1 slave
L2 slave
L3 slave
Public
network
L1 master
L2 master