Asterisk is an Open Source PBX and telephony toolkit. . This channel driver (chan_ooh323c) provides support for the H.323 protocol for Asterisk. This is an implementation by Objective Systems, Inc. and does not use the OpenH323 library. . This is one of many H.323 channel implementations for Asterisk with others being chan_h323 and chan_oh323, distributed by Debian as asterisk-h323 and asterisk-oh323, respectively. . For more information about the Asterisk PBX, have a look at the Asterisk package.