... are supported for VoIP business operation, such as Call through, Call back, Calling card, Call shop, Call center, Fax over IP, etc. More and more ... .30/pass through, Baud rate:14.4kbpsTrunk FeaturesSetting length of phone numberSupportedTDM channel managementSupportedOutbound route managementSupportedProhibited area callSupportedMulti-Routing management255 routing ...