7.1.1. Overview 
The feature “Large Enterprise Gatekeeper (LEGK)” is part of the
call processing software and has a gatekeeper function. Therefore the
IP address resolution mechanism (gatekeeper function) for IP trunking
is switchable in all network nodes.
For this function the STMI2/4 (HG 3500) board as hardware is required.
SIP-Protocol is used by default for trunking.
Figure 151. Example: IP trunking in an OpenScape 4000 networked system. LEGK is active in each node.
