2N NetStar Admin manual - Manual (Page 112)

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Call recording – the count of recording users or channels is licensed. One
licence is allocated to one virtual port channel or one station of an authorised
user. This means that 30 licences are needed to enable recording over the whole
ISDN PRI port. If, for example, your licence is limited to 10, calls via 10 channels
of this port will only be recorded.