sipvicious sip enumerate methods


Identify which SIP methods are accepted by the target.

What it does

Enumerate the SIP methods that are allowed by the target. This tool is used as part of reconnaissance and may be used with custom templatable SIP messages.

Tool functionality

The sip enumerate methods tool sends various SIP messages each with a different SIP method and displays the response code for each, if any. The purpose is to identify which SIP methods are supported by the target. If no response is returned by the target or an error (such as 501 or 405), the tool marks the SIP method as not supported.

The following is an example output of this tool:

INVITE   - supported      (404 User not found)
REGISTER - unsupported    (no response)
UPDATE   - unsupported    (405 Method not supported)

Command format

sipvicious sip enumerate methods <target1 [target2 [target3 ...]]> [flags]


  -u, --credentials string   set the username and password in the following format: username:password (e.g. 1000:test123)
  -D, --domain string        override domain name for the SIP address
  -e, --extension string     specify a target extension or SIP URI to target; if not specified, a random numeric extension is used when and where required
  -f, --from string          specify a from extension or SIP URI to set the from address; if not specified, a random numeric extension is used
  -m, --methods strings      set the SIP message methods to try (default [REGISTER,SUBSCRIBE,NOTIFY,PUBLISH,MESSAGE,INVITE,OPTIONS,BYE,CANCEL,ACK,PRACK,INFO,REFER,UPDATE])
      --rate string          specify how many packets to send for each period of time; format: packets/duration; e.g. 100/30ms
      --register             register before starting the enumeration; requires -u

Flags inherited from parent commands

      --ca-cert string       TLS CA Certificate
      --client-cert string   TLS client certificate
      --client-key string    TLS client private key
  -C, --config string        configuration file to use (may be JSON, TOML or YAML)
      --debug                set log level to debug
      --logfile string       specify a log filename
      --srtp string          specify if either none, dtls or sdes to enforce SRTP for calls; format: method or method:parameters; see full documentation for details (default "none")
      --templates string     Directory to search for template overrides (default ".")
      --tls-key-log string   TLS key log, - for stdout


sipvicious sip enumerate methods udp://target:5060
sipvicious sip enumerate methods tcp://target:5060 -e user1 -f user2
sipvicious sip enumerate methods tls://target:5060 -u user:password

Advanced examples

# setting the socket count, extension and overiding the domain during the enumeration
sipvicious sip enumerate methods udp:// -c 10 -e 2000 --domain siteonsip.tld

# register with the target before starting the enumeration
sipvicious sip enumerate methods udp:// -u 1000:1500 --register

# specifying a from string as well as the methods to be tried specifically
sipvicious sip enumerate methods udp:// --from 0000 --methods invite,register,prack,publish

# slow down and spread out the enumeration attack across different targets
sipvicious sip enumerate methods udp:// tls:// tcp:// --rate 1/30ms

Exit codes

This tool returns exit code 3, i.e. security issue is detected when a SIP method is found to be allowed without any authentication. This refers to most initiating SIP methods except for OPTIONS. The tool returns exit code 4, i.e. network connectivity problems, when the connection fails or when no response is received.

Flag: ca-cert

The CA cert can be passed when making use of client certificate authentication. The file should be formatted as PEM.

Flag: client-cert

The client certificate must be passed when making use of client certificate authentication. The file should be formatted as PEM.

Flag: client-key

The client key must be passed when making use of client certificate authentication. The file should be formatted as PEM.

Flag: config

Specify a configuration file which may be a JSON, TOML and YAML config format. To get the default settings and figure out which settings are available, one may run the sipvicious utils dump config command. This is typically used to create a template configuration that can then be edited as need be.

These settings may be overwritten when the corresponding flag is explicitly set, if one is present.

Flag: credentials

Specify valid credentials so that SIP method request can be done authenticated. The following format is used username:password (e.g. 1000:test123).

Flag: debug

Tells the logger to print out debug messages.

Flag: domain

A domain name can be specified so that the SIP URI contains that particular domain rather than the one specified as the target. This is useful for targets that expect a particular domain name.

Flag: extension

This flag allows users to set a particular extension in the SIP URI, overriding the default behaviour of targeting random extensions. The value can be either just the SIP extension/username (e.g. 1234) or a SIP URI (e.g.

Note that in the case of OPTIONS messages, if the extension parameter is not specified, then to URI and top most address do not contain the user part of the SIP URI (e.g. This has the effect of sending an OPTIONS to the SIP user-agent in the case of a SIP proxy, rather than to a particular user.

Flag: from

This flag allows users to set the From address, overriding the default behaviour of setting a random extension or the username in the credentials when one is provided. The value can be either just the SIP extension/username (e.g. 1234) or a SIP URI (e.g.

Flag: logfile

When the logfile flag is specified, a log file is created in the location specified and logs are generated in this file instead of being sent to standard output. If the filename ends with a .json file extension, then the output format is in JSON, otherwise it defaults to text format.

Flag: methods

Choose which SIP methods to enumerate. The default includes the following methods:

  • BYE
  • ACK
  • INFO

Flag: rate

Rate allows one to limit the attack below a certain rate. If the value is 100/30ms, that means that 100 packets should be spread out evenly across 30 milliseconds across all the connections per target.

Flag: register

Register requires credentials to be passed so that a REGISTER message is sent to authenticate with a registrar server before starting the test. The registration is maintained as per SIP standards, so that authentication does not time out.

Flag: srtp

The srtp flag when specified, allows users to set the SRTP mode. By default, outgoing calls do not make use of SRTP, while incoming calls automatically handle SRTP depending on the SDP body of the incoming INVITE message. When the srtp flag is set to none, incoming calls do not make use of SRTP, regardless of the SDP body in an incoming INVITE. The srtp mode can also be either dtls or sdes. In both dtls and sdes modes, the parameters are not required and will be generated randomly as need be.

Options for both dtls and sdes mode may be passed after a colon. For example:

  • TODO: --srtp dtls:cert.crt:cert.key[:ca.crt] where the first argument after the mode (dtls) is the public certificate cert.crt, then the private key cert.key and finally, the optional certificate authority file ca.crt
  • --srtp sdes:d0RmdmcmVCspeEc3QGZiNWpVLFJhQX1cfHAwJSoj where the argument is the base64 encoded cryptographic master key appended with the master salt.

Note that in the case of sdes key, the master key needs to be a valid length, which is 30 octets, for the default crypto-suite AES_CM_128_HMAC_SHA1_80.

Flag: templates

Allows one to set the template directory which is used to load (or save) the SIP templates.

To get the default SIP templates, make use of the sipvicious sip utils dump templates command.

Flag: tls-key-log

The TLS key log creates a file with the TLS key that can then be used to decrypt the TLS stream in tools that support it, such as Wireshark.