
50 Chapter 2 System telephony networking overview
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Figure 9 Call paths with and without TAT
Networking with ETSI QSIG
(International systems only)
ETSI QSIG is the European standard signaling protocol for multi-vendor peer-to-peer
communications between PBX systems and/or central offices.
See: “ETSI Euro network services” on page 51.
Figure 10 illustrates an ETSI QSIG network. Note that this is exactly the same setup as that shown
in the MCDN section for North America. The hardware programming for ETSI QSIG is described
in Table 6. All other configurations are the same as those shown in the MCDN section for North
America.
BCM
Telephone A
Telephone B
Telephone C
Forwarded call (using TAT)
Forwarded call (no TAT)
BCM
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