1.1.1. 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

1.2.1. OpenSER Modules

The following modules must be loaded before this module:

• No dependencies on other OpenSER modules.

1.2.2. External Libraries or Applications

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

• None.

1.3.1. 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.

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

1.3.2. 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.

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

1.3.3. 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.

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

1.3.4. 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.

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

1.3.5. 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.

...
replace("openser", "OpenSER SIP Proxy");
...

1.3.6. 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.

...
replace_body("openser", "OpenSER SIP Proxy");
...

1.3.7. 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.

...
replace_all("openser", "OpenSER SIP Proxy");
...

1.3.8. replace_body_all(re, txt)

Replaces all 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.

...
replace_body_all("openser", "OpenSER SIP Proxy");
...

1.3.9. 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.

...
# 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') ) {};

...

1.3.10. 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.

...
# 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')){$

...

1.3.11. 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.

...
# 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/')){$

...

1.3.12. 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.

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

...

1.3.13. 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.

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

1.3.14. append_hf(txt)

Appends 'txt' as header after the last 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.

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

...
append_hf("P-hint: VOICEMAIL\r\n");
append_hf("From-username: $fU\r\n");
...

1.3.15. append_hf(txt, hdr)

Appends 'txt' as header after first '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.

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

1.3.16. insert_hf(txt)

Inserts 'txt' as header before the first header field.

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.

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

...
insert_hf("P-hint: VOICEMAIL\r\n");
insert_hf("To-username: $tU\r\n");
...

1.3.17. insert_hf(txt, hdr)

Inserts 'txt' as header before first 'hdr' header field.

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.

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

1.3.18. 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.

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

1.3.19. is_present_hf(hf_name)

Return true if a header field is present in message.

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.

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

1.3.20. 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.

...
append_time();
...

1.3.21. 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 OpenSER 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.

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

1.3.22. remove_hf(hname)

Remove from message all headers with name "hname"

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.

...
if(remove_hf("User-Agent"))
{
    # User Agent header removed
}
...

1.3.23. has_body(), has_body(mime)

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

If a paramter 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.

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