General

It is necessary to have a connection to the PSTN or PLMN from the PBX. The signaling schemes that are supported are the following:

• ISDN/QSIG using a TLU76/11 or TLU77/1 board or MGU. Note that MGU2-X do not provide any ISDN interfaces.
• H.323 (trunk) using a IPLU board or an MGU
• DASS/DPNSS using a TLU 76/12 or TLU 77/2 board
• DT/DTMF/R2-MFC using a TLU 76/13 or TLU77/3 board
• SS7 using a TLU 76/14 board
• SIP (trunk) using an MGU or IPLU board

The ISDN/QSIG or H.323 scenario is shown in the following figure.

Figure 1. ISDN or H.323 Scenario