textops Module

Andrei Pelinescu-Onciul

   FhG FOKUS
   <pelinescu-onciul@fokus.fraunhofer.de>

Edited by

Andrei Pelinescu-Onciul

   <pelinescu-onciul@fokus.fraunhofer.de>

Edited by

Daniel-Constantin Mierla

   <miconda@gmail.com>

Edited by

Juha Heinanen

   <jh@tutpro.com>

   Copyright © 2003 FhG FOKUS
     __________________________________________________________________

   Table of Contents

   1. Admin Guide

        1. Overview

              1.1. Known Limitations

        2. Dependencies

              2.1. Kamailio Modules
              2.2. External Libraries or Applications

        3. Functions

              3.1. search(re)
              3.2. search_body(re)
              3.3. search_hf(hf, re, flags)
              3.4. search_append(re, txt)
              3.5. search_append_body(re, txt)
              3.6. replace(re, txt)
              3.7. replace_body(re, txt)
              3.8. replace_all(re, txt)
              3.9. replace_body_all(re, txt)
              3.10. replace_body_atonce(re, txt)
              3.11. subst('/re/repl/flags')
              3.12. subst_uri('/re/repl/flags')
              3.13. subst_user('/re/repl/flags')
              3.14. subst_body('/re/repl/flags')
              3.15. subst_hf(hf, subexp, flags)
              3.16. set_body(txt,content_type)
              3.17. set_reply_body(txt,content_type)
              3.18. filter_body(content_type)
              3.19. append_to_reply(txt)
              3.20. append_hf(txt[, hdr])
              3.21. insert_hf(txt[, hdr])
              3.22. append_urihf(prefix, suffix)
              3.23. is_present_hf(hf_name)
              3.24. is_present_hf_re(hf_name_re)
              3.25. append_time()
              3.26. append_time_to_request()
              3.27. is_method(name)
              3.28. remove_hf(hname)
              3.29. remove_hf_re(re)
              3.30. has_body(), has_body(mime)
              3.31. is_audio_on_hold()
              3.32. is_privacy(privacy_type)
              3.33. in_list(subject, list, separator)
              3.34. cmp_str(str1, str2)
              3.35. cmp_istr(str1, str2)
              3.36. starts_with(str1, str2)
              3.37. set_body_multipart([txt,content_type][,boundary])
              3.38. append_body_part(txt,content_type[,
                      content_disposition])

              3.39. remove_body_part(content_type)

        4. Known Limitations

   2. Developer Guide

        1. Functions

              1.1. load_textops(*import_structure)

   List of Examples

   1.1. search usage
   1.2. search_body usage
   1.3. search_body usage
   1.4. search_append usage
   1.5. search_append_body usage
   1.6. replace usage
   1.7. replace_body usage
   1.8. replace_all usage
   1.9. replace_body_all usage
   1.10. replace_body_atonce usage
   1.11. subst usage
   1.12. subst_uri usage
   1.13. subst usage
   1.14. subst_body usage
   1.15. search_body usage
   1.16. set_body usage
   1.17. set_reply_body usage
   1.18. filter_body usage
   1.19. append_to_reply usage
   1.20. append_hf usage
   1.21. insert_hf usage
   1.22. append_urihf usage
   1.23. is_present_hf usage
   1.24. is_present_hf_re usage
   1.25. append_time usage
   1.26. append_time_to_request usage
   1.27. is_method usage
   1.28. remove_hf usage
   1.29. remove_hf_re usage
   1.30. has_body usage
   1.31. is_audio_on_hold usage
   1.32. is_privacy usage
   1.33. in_list() usage
   1.34. cmp_str usage
   1.35. cmp_str usage
   1.36. starts_with usage
   1.37. set_body_multipart usage
   1.38. append_body_part usage
   1.39. remove_body_part usage

Chapter 1. Admin Guide

   Table of Contents

   1. Overview

        1.1. Known Limitations

   2. Dependencies

        2.1. Kamailio Modules
        2.2. External Libraries or Applications

   3. Functions

        3.1. search(re)
        3.2. search_body(re)
        3.3. search_hf(hf, re, flags)
        3.4. search_append(re, txt)
        3.5. search_append_body(re, txt)
        3.6. replace(re, txt)
        3.7. replace_body(re, txt)
        3.8. replace_all(re, txt)
        3.9. replace_body_all(re, txt)
        3.10. replace_body_atonce(re, txt)
        3.11. subst('/re/repl/flags')
        3.12. subst_uri('/re/repl/flags')
        3.13. subst_user('/re/repl/flags')
        3.14. subst_body('/re/repl/flags')
        3.15. subst_hf(hf, subexp, flags)
        3.16. set_body(txt,content_type)
        3.17. set_reply_body(txt,content_type)
        3.18. filter_body(content_type)
        3.19. append_to_reply(txt)
        3.20. append_hf(txt[, hdr])
        3.21. insert_hf(txt[, hdr])
        3.22. append_urihf(prefix, suffix)
        3.23. is_present_hf(hf_name)
        3.24. is_present_hf_re(hf_name_re)
        3.25. append_time()
        3.26. append_time_to_request()
        3.27. is_method(name)
        3.28. remove_hf(hname)
        3.29. remove_hf_re(re)
        3.30. has_body(), has_body(mime)
        3.31. is_audio_on_hold()
        3.32. is_privacy(privacy_type)
        3.33. in_list(subject, list, separator)
        3.34. cmp_str(str1, str2)
        3.35. cmp_istr(str1, str2)
        3.36. starts_with(str1, str2)
        3.37. set_body_multipart([txt,content_type][,boundary])
        3.38. append_body_part(txt,content_type[, content_disposition])
        3.39. remove_body_part(content_type)

   4. Known Limitations

1. Overview

   1.1. Known Limitations

   The module implements text based operations over the SIP message
   processed by Kamailio. SIP is a text based protocol and the module
   provides a large set of very useful functions to manipulate the message
   at text level, e.g., regular expression search and replace, Perl-like
   substitutions, checks for method type, header presence, insert of new
   header and date, etc.

1.1. Known Limitations

   search ignores folded lines. For example, search(“(From|f):.*@foo.bar”)
   doesn't match the following From header field:
From: medabeda
 <sip:medameda@foo.bar>;tag=1234

2. Dependencies

   2.1. Kamailio Modules
   2.2. External Libraries or Applications

2.1. Kamailio Modules

   The following modules must be loaded before this module:
     * No dependencies on other Kamailio modules.

2.2. External Libraries or Applications

   The following libraries or applications must be installed before
   running Kamailio with this module loaded:
     * None.

3. Functions

   3.1. search(re)
   3.2. search_body(re)
   3.3. search_hf(hf, re, flags)
   3.4. search_append(re, txt)
   3.5. search_append_body(re, txt)
   3.6. replace(re, txt)
   3.7. replace_body(re, txt)
   3.8. replace_all(re, txt)
   3.9. replace_body_all(re, txt)
   3.10. replace_body_atonce(re, txt)
   3.11. subst('/re/repl/flags')
   3.12. subst_uri('/re/repl/flags')
   3.13. subst_user('/re/repl/flags')
   3.14. subst_body('/re/repl/flags')
   3.15. subst_hf(hf, subexp, flags)
   3.16. set_body(txt,content_type)
   3.17. set_reply_body(txt,content_type)
   3.18. filter_body(content_type)
   3.19. append_to_reply(txt)
   3.20. append_hf(txt[, hdr])
   3.21. insert_hf(txt[, hdr])
   3.22. append_urihf(prefix, suffix)
   3.23. is_present_hf(hf_name)
   3.24. is_present_hf_re(hf_name_re)
   3.25. append_time()
   3.26. append_time_to_request()
   3.27. is_method(name)
   3.28. remove_hf(hname)
   3.29. remove_hf_re(re)
   3.30. has_body(), has_body(mime)
   3.31. is_audio_on_hold()
   3.32. is_privacy(privacy_type)
   3.33. in_list(subject, list, separator)
   3.34. cmp_str(str1, str2)
   3.35. cmp_istr(str1, str2)
   3.36. starts_with(str1, str2)
   3.37. set_body_multipart([txt,content_type][,boundary])
   3.38. append_body_part(txt,content_type[, content_disposition])
   3.39. remove_body_part(content_type)

3.1.  search(re)

   Searches for the re in the message.

   Meaning of the parameters is as follows:
     * re - Regular expression.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.1. search usage
...
if ( search("[Ss][Ii][Pp]") ) { /*....*/ };
...

3.2.  search_body(re)

   Searches for the re in the body of the message.

   Meaning of the parameters is as follows:
     * re - Regular expression.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.2. search_body usage
...
if ( search_body("[Ss][Ii][Pp]") ) { /*....*/ };
...

3.3.  search_hf(hf, re, flags)

   Searches for the re in the body of a header field.

   Meaning of the parameters is as follows:
     * hf - header field name.
     * re - regular expression.
     * flags - control flags - it has to be one of: a - all headers
       matching the name; f - only first header matching the name; l -
       only the last header matching the name.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.3. search_body usage
...
if ( search_hf("From", ":test@", "a") ) { /*....*/ };
...

3.4.  search_append(re, txt)

   Searches for the first match of re and appends txt after it.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String to be appended.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.4. search_append usage
...
search_append("[Oo]pen[Ss]er", " SIP Proxy");
...

3.5.  search_append_body(re, txt)

   Searches for the first match of re in the body of the message and
   appends txt after it.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String to be appended.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.5. search_append_body usage
...
search_append_body("[Oo]pen[Ss]er", " SIP Proxy");
...

3.6.  replace(re, txt)

   Replaces the first occurrence of re with txt.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.6. replace usage
...
replace("openser", "Kamailio SIP Proxy");
...

3.7.  replace_body(re, txt)

   Replaces the first occurrence of re in the body of the message with
   txt.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.7. replace_body usage
...
replace_body("openser", "Kamailio SIP Proxy");
...

3.8.  replace_all(re, txt)

   Replaces all occurrence of re with txt.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.8. replace_all usage
...
replace_all("openser", "Kamailio SIP Proxy");
...

3.9.  replace_body_all(re, txt)

   Replaces all occurrence of re in the body of the message with txt.
   Matching is done on a per-line basis.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.9. replace_body_all usage
...
replace_body_all("openser", "Kamailio SIP Proxy");
...

3.10.  replace_body_atonce(re, txt)

   Replaces all occurrence of re in the body of the message with txt.
   Matching is done over the whole body.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.10. replace_body_atonce usage
...
# strip the whole body from the message:
if(has_body() && replace_body_atonce("^.+$", ""))
        remove_hf("Content-Type");
...

3.11.  subst('/re/repl/flags')

   Replaces re with repl (sed or perl like).

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can be a
       combination of i (case insensitive), g (global) or s (match newline
       don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain pseudo-varibales
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.11. subst usage
...
# replace the uri in to: with the message uri (just an example)
if ( subst('/^To:(.*)sip:[^@]*@[a-zA-Z0-9.]+(.*)$/t:\1\u\2/ig') ) {};

# replace the uri in to: with the value of avp sip_address (just an example)
if ( subst('/^To:(.*)sip:[^@]*@[a-zA-Z0-9.]+(.*)$/t:\1$avp(sip_address)\2/ig') )
 {};

...

3.12.  subst_uri('/re/repl/flags')

   Runs the re substitution on the message uri (like subst but works only
   on the uri)

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can be a
       combination of i (case insensitive), g (global) or s (match newline
       don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain pseudo-varibales
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.12. subst_uri usage
...
# adds 3463 prefix to numeric uris, and save the original uri (\0 match)
# as a parameter: orig_uri (just an example)
if (subst_uri('/^sip:([0-9]+)@(.*)$/sip:3463\1@\2;orig_uri=\0/i')){$

# adds the avp 'uri_prefix' as prefix to numeric uris, and save the original
# uri (\0 match) as a parameter: orig_uri (just an example)
if (subst_uri('/^sip:([0-9]+)@(.*)$/sip:$avp(uri_prefix)\1@\2;orig_uri=\0/i')){$

...

3.13.  subst_user('/re/repl/flags')

   Runs the re substitution on the message uri (like subst_uri but works
   only on the user portion of the uri)

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can be a
       combination of i (case insensitive), g (global) or s (match newline
       don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain pseudo-varibales
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.13. subst usage
...
# adds 3463 prefix to uris ending with 3642 (just an example)
if (subst_user('/3642$/36423463/')){$

...
# adds avp 'user_prefix' as prefix to username in r-uri ending with 3642
if (subst_user('/(.*)3642$/$avp(user_prefix)\13642/')){$

...

3.14.  subst_body('/re/repl/flags')

   Replaces re with repl (sed or perl like) in the body of the message.

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can be a
       combination of i (case insensitive), g (global) or s (match newline
       don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain pseudo-varibales
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.14. subst_body usage
...
if ( subst_body('/^o=(.*) /o=$fU /') ) {};

...

3.15.  subst_hf(hf, subexp, flags)

   Perl-like substitutions in the body of a header field.

   Meaning of the parameters is as follows:
     * hf - header field name.
     * subexp - substitution expression in the same format as of the
       'subst' function parameter.
     * flags - control flags - it has to be one of: a - all headers
       matching the name; f - only first header matching the name; l -
       only the last header matching the name.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.15. search_body usage
...
if ( subst_hf("From", "/:test@/:best@/", "a") ) { /*....*/ };
...

3.16.  set_body(txt,content_type)

   Set body to a SIP message.

   Meaning of the parameters is as follows:
     * txt - text for the body, can include pseudo-variables.
     * content_type - value of Content-Type header, can include
       pseudo-variables.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.16. set_body usage
...
set_body("test", "text/plain");
...

3.17.  set_reply_body(txt,content_type)

   Set body to a SIP reply to be generated by Kamailio.

   Meaning of the parameters is as follows:
     * txt - text for the body, can include pseudo-variables.
     * content_type - value of Content-Type header, can include
       pseudo-variables.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
   BRANCH_ROUTE.

   Example 1.17. set_reply_body usage
...
set_reply_body("test", "text/plain");
...

3.18.  filter_body(content_type)

   Filters multipart/mixed body by leaving out all other body parts except
   the first body part of given type.

   Meaning of the parameters is as follows:
     * content_type - Content type to be left in the body.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.18. filter_body usage
...
if (has_body("multipart/mixed")) {
    if (filter_body("application/sdp") {
        remove_hf("Content-Type");
        append_hf("Content-Type: application/sdp\r\n");
    } else {
        xlog("Body part application/sdp not found\n");
    }
}
...

3.19.  append_to_reply(txt)

   Append txt as header to the reply.

   Meaning of the parameters is as follows:
     * txt - String which may contains pseudo-variables.

   This function can be used from REQUEST_ROUTE, BRANCH_ROUTE,
   FAILURE_ROUTE, ERROR_ROUTE.

   Example 1.19. append_to_reply usage
...
append_to_reply("Foo: bar\r\n");
append_to_reply("Foo: $rm at $Ts\r\n");
...

3.20.  append_hf(txt[, hdr])

   Appends 'txt' as header after first header field or after last 'hdr'
   header field.

   Meaning of the parameters is as follows:
     * txt - Header field to be appended. The value can contain
       pseudo-variables which will be replaced at run time.
     * hdr - Header name after which the 'txt' is appended.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.20. append_hf usage
...
append_hf("P-hint: VOICEMAIL\r\n");
append_hf("From-username: $fU\r\n", "Call-ID");
...

3.21.  insert_hf(txt[, hdr])

   Inserts 'txt' as header before the first header field or before first
   'hdr' header field if 'hdr' is given.

   Meaning of the parameters is as follows:
     * txt - Header field to be inserted. The value can contain
       pseudo-variables which will be replaced at run time.
     * hdr - Header name before which the 'txt' is inserted.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.21. insert_hf usage
...
insert_hf("P-hint: VOICEMAIL\r\n");
insert_hf("To-username: $tU\r\n");
insert_hf("P-hint: VOICEMAIL\r\n", "Call-ID");
insert_hf("To-username: $tU\r\n", "Call-ID");
...

3.22.  append_urihf(prefix, suffix)

   Append header field name with original Request-URI in middle.

   Meaning of the parameters is as follows:
     * prefix - string (usually at least header field name).
     * suffix - string (usually at least line terminator).

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
   BRANCH_ROUTE.

   Example 1.22. append_urihf usage
...
append_urihf("CC-Diversion: ", "\r\n");
...

3.23.  is_present_hf(hf_name)

   Return true if a header field is present in message.

Note

   The function is also able to distinguish the compact names. For exmaple
   “From” will match with “f”

   Meaning of the parameters is as follows:
     * hf_name - Header field name.(long or compact form)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.23. is_present_hf usage
...
if (is_present_hf("From")) log(1, "From HF Present");
...

3.24.  is_present_hf_re(hf_name_re)

   Return true if a header field whose name matches regular expression
   'hf_name_re' is present in message.

   Meaning of the parameters is as follows:
     * hf_name_re - Regular expression to match header field name.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.24. is_present_hf_re usage
...
if (is_present_hf_re("^P-")) log(1, "There are headers starting with P-\n");
...

3.25.  append_time()

   Adds a time header to the reply of the request. You must use it before
   functions that are likely to send a reply, e.g., save() from
   'registrar' module. Header format is: “Date: %a, %d %b %Y %H:%M:%S
   GMT”, with the legend:
     * %a abbreviated week of day name (locale)
     * %d day of month as decimal number
     * %b abbreviated month name (locale)
     * %Y year with century
     * %H hour
     * %M minutes
     * %S seconds

   Return true if a header was succesfully appended.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
   BRANCH_ROUTE.

   Example 1.25. append_time usage
...
append_time();
...

3.26.  append_time_to_request()

   Adds a time header to the request. Header format is: “Date: %a, %d %b
   %Y %H:%M:%S GMT”, with the legend:
     * %a abbreviated week of day name (locale)
     * %d day of month as decimal number
     * %b abbreviated month name (locale)
     * %Y year with century
     * %H hour
     * %M minutes
     * %S seconds

   Return true if a header was succesfully appended.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.26. append_time_to_request usage
...
if(!is_present_hf("Date"))
    append_time_to_request();
...

3.27.  is_method(name)

   Check if the method of the message matches the name. If name is a known
   method (invite, cancel, ack, bye, options, info, update, register,
   message, subscribe, notify, refer, prack), the function performs method
   ID testing (integer comparison) instead of ignore case string
   comparison.

   The 'name' can be a list of methods in the form of
   'method1|method2|...'. In this case, the function returns true if the
   SIP message's method is one from the list. IMPORTANT NOTE: in the list
   must be only methods defined in Kamailio with ID (invite, cancel, ack,
   bye, options, info, update, register, message, subscribe, notify,
   refer, prack, publish; for more see:
   http://www.iana.org/assignments/sip-parameters).

   If used for replies, the function tests the value of method field from
   CSeq header.

   Meaning of the parameters is as follows:
     * name - SIP method name

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, and BRANCH_ROUTE.

   Example 1.27. is_method usage
...
if(is_method("INVITE"))
{
    # process INVITEs here
}
if(is_method("OPTION|UPDATE"))
{
    # process OPTIONs and UPDATEs here
}
...

3.28.  remove_hf(hname)

   Remove from message all headers with name “hname”. Header matching is
   case-insensitive. Matches and removes also the compact header forms.

   Returns true if at least one header is found and removed.

   Meaning of the parameters is as follows:
     * hname - header name to be removed.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.28. remove_hf usage
...
if(remove_hf("User-Agent"))
{
    # User Agent header removed
}
# compact form: remove "Contact" or "m" header
remove_hf("Contact")
# compact form: remove "Contact" or "m" header
remove_hf("m")
...

3.29.  remove_hf_re(re)

   Remove from message all headers with name matching regular expression
   “re”

   Returns true if at least one header is found and removed.

   Meaning of the parameters is as follows:
     * re - regular expression to match the header name to be removed.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.29. remove_hf_re usage
...
if(remove_hf_re("^P-"))
{
    # All headers starting with "P-" removed
}
...

3.30.  has_body(), has_body(mime)

   The function returns true if the SIP message has a body attached. The
   checked includes also the “Content-Length” header presence and value.

   If a parameter is given, the mime described will be also checked
   against the “Content-Type” header.

   Meaning of the parameters is as follows:
     * mime - mime to be checked against the “Content-Type” header. If not
       present or 0, this check will be disabled.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.30. has_body usage
...
if(has_body("application/sdp"))
{
    # do interesting stuff here
}
...

3.31.  is_audio_on_hold()

   The function returns true if the SIP message has a body attached and at
   least one audio stream in on hold.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.31. is_audio_on_hold usage
...
if(is_audio_on_hold())
{
    # do interesting stuff here
}
...

3.32.  is_privacy(privacy_type)

   The function returns true if the SIP message has a Privacy header field
   that includes the given privacy_type among its privacy values. See
   http://www.iana.org/assignments/sip-priv-values for possible privacy
   type values.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.32. is_privacy usage
...
if(is_privacy("id"))
{
    # do interesting stuff here
}
...

3.33.  in_list(subject, list, separator)

   Function checks if subject string is found in list string where list
   items are separated by separator string. Subject and list strings may
   contain pseudo variables. Separator string needs to be one character
   long. Returns 1 if subject is found and -1 otherwise.

   Function can be used from all kinds of routes.

   Example 1.33. in_list() usage
...
$var(subject) = "fi";
$var(list) = "dk,fi,no,se";
if (in_list("$var(subject)", "$var(list)", ",") {
    xlog("L_INFO", "subject is found in list\n");
}
...

3.34.  cmp_str(str1, str2)

   The function returns true if the two parameters matches as string case
   sensitive comparison.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.34. cmp_str usage
...
if(cmp_str("$rU", "kamailio"))
{
    # do interesting stuff here
}
...

3.35.  cmp_istr(str1, str2)

   The function returns true if the two parameters matches as string case
   insensitive comparison.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.35. cmp_str usage
...
if(cmp_istr("$rU@you", "kamailio@YOU"))
{
    # do interesting stuff here
}
...

3.36.  starts_with(str1, str2)

   The function returns true if the first string starts with the second
   string.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE and BRANCH_ROUTE.

   Example 1.36. starts_with usage
...
if (starts_with("$rU", "+358"))
{
    # do interesting stuff here
}
...

3.37.  set_body_multipart([txt,content_type][,boundary])

   Set multipart body to a SIP message. If called with no parameters, will
   convert present body to multipart.

   Meaning of the parameters is as follows:
     * txt - text for the body, can include pseudo-variables.
     * content_type - value of Content-Type header, can include
       pseudo-variables.
     * boundary - string to use as boundary, can include pseudo-variables.
       Default: unique-boundary-1

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
   BRANCH_ROUTE.

   The core will take care of the last boundary ending "--". Detecting
   wich one is the last and fixing the others if needed.

   Example 1.37. set_body_multipart usage
...
set_body_multipart("test", "text/plain", "delimiter");
...
Will produce:
...
Content-Type: multipart/mixed;boundary="delimiter"
Mime-Version: 1.0

--delimiter
Content-Type: text/plain

text

--delimiter
...

3.38.  append_body_part(txt,content_type[, content_disposition])

   Append a part on multipart body SIP message. Will use
   "unique-boundary-1" as boundary.

   Meaning of the parameters is as follows:
     * txt - text for the multipart body, can include pseudo-variables.
     * content_type - value of Content-Type header, can include
       pseudo-variables.
     * content_disposition - value of Content-Disposition header, can
       include pseudo-variables.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
   BRANCH_ROUTE.

   The core will take care of the last boundary ending "--". Detecting
   wich one is the last and fixing the others if needed.

   Example 1.38. append_body_part usage
...
$var(b) = "7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c"
append_body_part("$var(b)", "application/vnd.cirpack.isdn-ext", "signal;handling
=required");
...
Will append this the body:
...
Content-Type: application/vnd.cirpack.isdn-ext
Content-Disposition: signal;handling=required

7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c

--unique-boundary-1
...

3.39.  remove_body_part(content_type)

   Remove a part on a multipart body SIP message.

   Meaning of the parameters is as follows:
     * content_type - value of Content-Type header of the part to be
       removed. If more than one exists the first occurrence will be
       removed.

   This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
   BRANCH_ROUTE.

   The core will take care of the last boundary ending "--". Detecting
   wich one is the last and fixing the others if needed.

   Example 1.39. remove_body_part usage
...
remove_body_part("application/vnd.cirpack.isdn-ext");
...

4. Known Limitations

   Search functions are applied to the original request, i.e., they ignore
   all changes resulting from message processing in Kamailio script.

Chapter 2. Developer Guide

   Table of Contents

   1. Functions

        1.1. load_textops(*import_structure)

1. Functions

   1.1. load_textops(*import_structure)

1.1.  load_textops(*import_structure)

   For programmatic use only--import the Textops API.

   Meaning of the parameters is as follows:
     * import_structure - Pointer to the import structure - see “struct
       textops_binds” in modules/textops/api.h