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opensips - Man Page

flexible and roboust SIP (RFC3261, RFC3263) server for Voice over IP (VoIP)


opensips [ -hcCrRvdDEVT ] [ -f config-file ] [ -l address ] [ -n processes-no ] [ -N tcp processes-no ] [ -b max_rcv_buf_size ] [ -m shared_mem_size ] [ -w working-dir ] [ -W method ] [ -t chroot-dir ] [ -u uid ] [ -g gid ] [ -P pid-file ] [ -i fifo-path ] [ -x socket-path ]


OpenSIPS is a SIP-based VoIP server running on most Unix-like operating systems. It supports UDP, TCP and TLS transport layers. Among its features:



Displays a short usage description, including all available options.


Checks the config file and displays the aliases and listen interface list.


Similar to -c but in addition checks the flags of exported functions from included route blocks.


Uses dns to check if it is necessary to add a "received=" field to a via.


Same as -r but uses reverse dns.


Turns on via host checking when forwarding replies.


Turns on debugging, multiple -d increase the debug level.


Runs opensips in the foreground (it doesn't fork into daemon mode).


Sends all the log messages to stderr.


Disables TCP support.


Displays the version number.

-f config-file

Reads the configuration from config-file (default /usr/etc/opensips/opensips.cfg ).

-l address

Listens on the specified address/interface. Multiple -l mean listening on multiple addresses. The address format is  [proto:]address[:port], where proto = udp|tcp and address = host|ip_address|interface_name. Example: -l localhost,  -l udp:, -l eth0:5062. The default behaviour is to listen on all the ipv4 interfaces.

-n processes-no

Specifies the number of children processes forked per interface (default 8).

-N tcp processes-no

Specifies the number of children processes forked to handle tcp incoming connections (by default is equal to -n ).

-b max_rcv_buf_size

Maximum receive buffer size which will not be exceeded by the auto-probing procedure even if the OS allows.

-m shared_mem_size

Size of the shared memory which will be allocated (in Megabytes).

-w working-dir

Specifies the working directory. In the very improbable event that opensips will crash, the core file will be generated here.

-W method

Specify poll method.

-t chroot-dir

Forces opensips to chroot after reading the config file.

-u uid

Changes the user id under which opensips runs.

-g gid

Changes the group id under which opensips runs.

-P pid-file

Creates a file containing the pid of the main opensips process.

-i fifo-path

Creates a fifo, useful for monitoring opensips status.

-x socket-path

Creates a unix socket, useful for monitoring opensips status ( same as -i fifo-path but using instead unix sockets).




see /usr/share/doc/opensips/AUTHORS

See Also


Full documentation on opensips is available at https://opensips.org/.

Project tracker and GIT https://github.com/OpenSIPS/opensips.

Mailing lists:

users@lists.opensips.org - opensips user community
devel@lists.opensips.org - opensips development, new features and unstable version

Referenced By


08.06.2006 OpenSIPS VoIP SIP Server