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The number of the trunk over which the call is routed. This member is used for both incoming and outgoing calls.
Not all service providers support use of this information.
**TAPI 2.x: **lineGetCallInfo, dwTrunk of LINECALLINFO
**TAPI 3.x: **ITCallInfo::get_CallInfoLong, called with CIL_TRUNK member of CALLINFO_LONG