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HelperDescription
FTPFTP service helper
h323H323H323 service helper
ircIRCIRC service helper
PPTPPPTP tunneling helper
udpliteUDPLITEUDP-Lite service helper
dccpDCCPDCCP service helper
sctpSCTPSCTP service helper
SIPSIP helper. Additional options:
  • sip-direct-media allows redirecting the RTP media stream to go directly from the caller to the callee. The default value is yes.
  • sip-timeout allows adjusting TTL of SIP UDP connections. Default: 1 hour. In some setups, you have to reduce that.
tftpTFTPTFTP service helper
RSTPRTSP service helper


Note

udplite, dccp, and sctp are built-in services of the connection tracking. Since these are not separately loaded modules, they cannot be disabled separately, they got disabled together with the connection tracking.

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