SipTrace Module

Daniel-Constantin Mierla

Edited by

Alexandr Dubovikov

Edited by

Daniel-Constantin Mierla

Table of Contents

1. Admin Guide
1. Overview
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
3. Parameters
3.1. db_url (str)
3.2. table (str)
3.3. trace_flag (integer)
3.4. trace_on (integer)
3.5. traced_user_avp (str)
3.6. trace_table_avp (str)
3.7. duplicate_uri (str)
3.8. trace_to_database (integer)
3.9. trace_local_ip (str)
3.10. trace_sl_acks (integer)
3.11. xheaders_write (integer)
3.12. xheaders_read (integer)
3.13. hep_mode_on (integer)
3.14. hep_version (integer)
3.15. hep_capture_id (integer)
3.16. trace_delayed (integer)
4. Functions
4.1. sip_trace()
5. MI Commands
5.1. sip_trace
6. RPC Commands
6.1. siptrace.status param
7. Database setup
8. Known issues

List of Examples

1.1. Set db_url parameter
1.2. Set sip_trace parameter
1.3. Set trace_flag parameter
1.4. Set trace_on parameter
1.5. Set traced_user_avp parameter
1.6. Set trace_table_avp parameter
1.7. Set duplicate_uri parameter
1.8. Set trace_to_database parameter
1.9. Set trace_local_ip parameter
1.10. Set trace_sl_acks parameter
1.11. Set xheaders_write parameter
1.12. Set xheaders_read parameter
1.13. Set hep_mode_on parameter
1.14. Set hep_version parameter
1.15. Set hep_capture_id parameter
1.16. Set trace_delayed parameter
1.17. sip_trace() usage

Chapter 1. Admin Guide

1. Overview

Offer a possibility to store incoming and outgoing SIP messages in a database and/or duplicate to the capturing server (using the Homer encapsulation protocol or plain SIP mode)

There are two ways of storing information.

  • by calling explicitely the sip_trace() method in Kamailio configuration file. In this case the original message is processed.

  • by setting the flag equal with the value of 'trace_flag' (e.g., setflag(__trace_flag__)) parameter of the module. In this case, the message sent forward is processed. The logging mechanism is based on TM/SL callbacks, so only messages processed with TM/SL are logged.

The tracing can be turned on/off using Kamailio mi or RPC commands.

kamctl fifo sip_trace on

kamctl fifo sip_trace off

2. Dependencies

2.1. Kamailio Modules

The following modules must be loaded before this module:

  • database module - Mysql, Postgres, dbtext, unixODBC...

  • tm and sl modules - optional, only if you want to trace messages forwarded by these modules.

2.2. External Libraries or Applications

The following libraries or applications must be installed before running Kamailio with this module loaded:

  • None.

3. Parameters

3.1. db_url (str)

Database URL.

Default value is "mysql://kamailio:kamailiorw@localhost/okamailio".

Example 1.1. Set db_url parameter

modparam("siptrace", "db_url", "mysql://user:passwd@host/dbname")

3.2. table (str)

Name of the table where to store the SIP messages.

Default value is "sip_trace".

Example 1.2. Set sip_trace parameter

modparam("siptrace", "table", "strace")

3.3. trace_flag (integer)

Which flag is used to mark messages to trace

Default value is "0".

Example 1.3. Set trace_flag parameter

modparam("siptrace", "trace_flag", 22)

3.4. trace_on (integer)

Parameter to enable/disable trace (on(1)/off(0))

Default value is "0".

Example 1.4. Set trace_on parameter

modparam("siptrace", "trace_on", 1)

3.5. traced_user_avp (str)

The name of the AVP storing the SIP URI of the traced user. If the AVP is set, messages are stored in database table and 'traced_user' column is filled with AVP's value. You can store the message many times for many users by having multiple values for this AVP.

Default value is "NULL" (feature disabled).

Example 1.5. Set traced_user_avp parameter

modparam("siptrace", "traced_user_avp", "$avp(i:123)")
modparam("siptrace", "traced_user_avp", "$avp(s:user)")

3.6. trace_table_avp (str)

The name of the AVP storing the name of the table where to store the SIP messages. If it is not set, the value of 'table' parameter is used. In this way one can select dynamically where to store the traced messages. The table must exists, and must have the same structure as 'sip_trace' table.

Default value is "NULL" (feature disabled).

Example 1.6. Set trace_table_avp parameter

modparam("siptrace", "trace_table_avp", "$avp(i:345)")
modparam("siptrace", "trace_table_avp", "$avp(s:siptrace_table)")

3.7. duplicate_uri (str)

The address in form of SIP uri where to send a duplicate of traced message. It uses UDP all the time.

Default value is "NULL".

Example 1.7. Set duplicate_uri parameter

modparam("siptrace", "duplicate_uri", "sip:")

3.8. trace_to_database (integer)

Parameter to enable/disable inserts to the Database from this Kamailio.

In case we only want to send the SIP-Messages to the duplicate_uri and not store the information to the local database we can set this to "0".

Default value is "1".

Example 1.8. Set trace_to_database parameter

modparam("siptrace", "trace_to_database", 0)

3.9. trace_local_ip (str)

The address to be used in fromip field for local generated messages. If not set, the module sets it to the address of the socket that will be used to send the message.

Default value is "NULL".

Example 1.9. Set trace_local_ip parameter

modparam("siptrace", "trace_local_ip", "")

3.10. trace_sl_acks (integer)

Parameter to enable/disable tracing of SL-filtered ACKs (on=1 / off=0).

By default all ACKs to replies generated by SL module are traced. There is no way to select among them. Now SL module is able to run an event route when such ACK arrives (event_route[sl:filtered-ack]). You can set this parameter to 0 and then execute sip_trace() in the event route, accompanied by config rules to decide which ACK to trace.

Default value is "1".

Example 1.10. Set trace_sl_acks parameter

modparam("siptrace", "trace_sl_acks", 0)

3.11. xheaders_write (integer)

Parameter to enable/disable writing of x-headers.

Stores fromip, toip, method and direction in X-Siptrace-* headers. This allows to transmit them to a second kamailio server using the duplicate_uri feature. Because the headers are added after the data is written to the database, the headers only show up in the packets sent by duplicate_uri.

See xheaders_read, it should be used on the receiving side.

Note: The headers are first read, then written. This allows to relay the information over more then two kamailio servers by setting both xheaders_write and xheaders_read to "1" on the servers in the middle.

Default value is "0".

Example 1.11. Set xheaders_write parameter

modparam("siptrace", "xheaders_write", 0)

3.12. xheaders_read (integer)

Parameter to enable/disable reading of x-headers.

Reads and removes the X-Siptrace-* headers. Packets not containing the headers are neither stored to the database nor relayed (duplicate_uri). See xheaders_write for further information.

Default value is "0".

Example 1.12. Set xheaders_read parameter

modparam("siptrace", "xheaders_read", 0)

3.13. hep_mode_on (integer)

Parameter to enable/disable homer encapsulate mode (on(1)/off(0))

Default value is "0".

Example 1.13. Set hep_mode_on parameter

modparam("siptrace", "hep_mode_on", 1)

3.14. hep_version (integer)

The parameter indicate the version of HEP protocol. Can be 1 or 2. In HEPv2 the timestamp and capture agent ID will be included to HEP header.

Default value is "1".

Example 1.14. Set hep_version parameter

modparam("siptrace", "hep_version", 2)

3.15. hep_capture_id (integer)

The parameter indicate the capture agent ID for HEPv2 protocol. Limitation: 16-bit integer.

Default value is "1".

Example 1.15. Set hep_capture_id parameter

modparam("siptrace", "hep_capture_id", 234)

3.16. trace_delayed (integer)

Use 'INSERT DELAYED' to store to database when it is available, instead of 'INSERT'.

Default value is 0 (off).

Example 1.16. Set trace_delayed parameter

modparam("siptrace", "trace_delayed", 1)

4. Functions

4.1.  sip_trace()

Store current processed SIP message in database. It is stored in the form prior applying chages made to it.


Example 1.17. sip_trace() usage


5. MI Commands

5.1.  sip_trace

Name: sip_trace


  • trace_mode : turns on/off SIP message tracing. Possible values are:

    • on

    • off

    The parameter is optional - if missing, the command will return the status of the SIP message tracing (as string on or off ) without changing anything.

MI FIFO Command Format:


6. RPC Commands

6.1.  siptrace.status param

Name: siptrace.status


  • on or off: turns on/off SIP message tracing.. Possible values are:

    • on

    • off

  • check does not change siptrace status, just reports the current status.

7. Database setup

Before running Kamailio with siptrace, you have to setup the database tables where the module will store the data. For that, if the table were not created by the installation script or you choose to install everything by yourself you can use the siptrace-create.sql SQL script in the database directories in the kamailio/scripts folder as template. You can also find the complete database documentation on the project webpage,

8. Known issues

Stateless forwarded messages (forward()) are not logged if you set the flag, use sip_trace().