Voice networking channel licenses within the IP500 are needed for the use of private voice networking trunks between IP500 control units. H323 IP trunks setup on the IP500 including IP trunks being used for an IP Office Small Community Network (SCN). For the use of trunks configured to the QSIG operation, voice networking license is also required. H232 IP trunk, a license instance is consumed for each simultaneous outgoing call. Incoming calls do not use a license. Number of calls are limited by the trunk type rather than available licenses on the QSIG trunk.