voicemail (voicemail2email) application 

This application plays a greeting message to the caller, records a 
voicemail and sends it out as email via SMTP.

Audio Files
-----------

The voicemail application looks in various file system paths or database
tables for announce and beep messages to be played.

If file system is used to store audio files, the announcement file to be
played is looked for in the following order:

 <announce_path><domain><user>'.wav'
 <announce_path><domain><language><default_announce>
 <announce_path><domain><default_announce>
 <announce_path><language><default_announce>
 <announce_path><default_announce>

where <announce_path> and <default_announce> is set in voicemail.conf,
<domain> is the host part of the request URI, <user> the user part of 
the request URI, and <language> is the App-Param 'Language' (see below).

If MySQL database is used to store audio files, the announcement to be
played is looked for first from user_audio table, then from domain_audio
table, and last from default_audio table.  The last two tables are
defined as described in Readme.conference.  user_audio table is defined
as follows:

CREATE TABLE user_audio (
  id int(10) unsigned NOT NULL auto_increment,
  application varchar(32) NOT NULL,
  message varchar(32) NOT NULL,
  domain varchar(128) NOT NULL,
  userid varchar(64) NOT NULL,
  audio mediumblob NOT NULL,
  PRIMARY KEY  (id),
  UNIQUE KEY application (application,message,domain,userid)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1;

Beep sound to be played is looked for only from default_audio table.

Application value is 'voicemail' and message values are 'greeting_msg'
and 'beep_snd'.

When an audio file is fetched from database, it is stored in /tmp
directory.

Mail Server
-----------

The mail server to send the email with is configured in the main
sems.conf in smtp_server/smtp_port.

Other Items
-----------

Further configuration items (voicemail.conf):

max_record_time - voicemail records voicemail up to the number of 
                  seconds set here

rec_file_ext - extension of recorded voicemail file. this defines the 
               format of the recorded message: default is .wav, .mp3 
	       will record a voicemail as MP3 file (the mp3 plugin needs
	       to be loaded so that mp3 encoding is possible)


App-Params
----------

These must be passed as headers with the INVITE request to SEMS, so that 
SEMS knows at least the email address to send the email to.

   Email-Address   - mandatory (!): the email address to send the mail to
   Language        - optional: language for announcement file

  Example:
    P-Iptel-App: voicemail
    P-App-Param: Email-Address=user@maildomain.net;Language=Latvian

  old deprecated header format:
    P-Email-Address: user@maildomain.net
    P-Language: Latvian

Voicemail email templates 
-------------------------

The format of the email can be configured using email templates.  Email
templates will help you to customize the emails sent by Voicemail. Just
configure the path where the templates can be found and edit your
template files.  You will find detailed informations in the following
sections.

Configuration parameters within voicemail.conf:
----------------------------------------------

This is needed in template files are kept in file system:

email_template_path: 

	- sets the directory which will be searched for
	  email template files (*.template).

	- each template file stands for a different domain:
	    <domain>.template
	    Ex: iptel.org.template

	- additionaly, a default template must be present in
	  the directory configured with that configuration
	  parameter. It must be named 'default.template'.

If you configured email_template_path well and turned debug informations
on, you should find in the log file during loading process following lines:

(9834) DEBUG: loadEmailTemplates (AnswerMachine.cpp:102): loading plug-in/voicemail/default.template ...
(9834) DEBUG: loadEmailTemplates (AnswerMachine.cpp:102): loading plug-in/voicemail/iptel.org.template ...
(9834) DEBUG: loadEmailTemplates (AnswerMachine.cpp:102): loading plug-in/voicemail/susie.at.template ...

If template files are kept in MySQL database, they are looked for first
from domain_template table and then from default_template table, which
are defined as follows:

CREATE TABLE domain_template (
  id int(10) unsigned NOT NULL,
  application varchar(32) NOT NULL,
  message varchar(32) NOT NULL,
  domain varchar(128) NOT NULL,
  `language` char(2) default NULL,
  template text NOT NULL,
  PRIMARY KEY  (id)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

CREATE TABLE default_template (
  id int(10) unsigned NOT NULL auto_increment,
  application varchar(32) NOT NULL,
  message varchar(32) NOT NULL,
  `language` char(2) default NULL,
  template text NOT NULL,
  PRIMARY KEY  (id)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1;

Application value is 'voicemail' and message value is 'email_tmpl'.

When an audio file is fetched from database, it is stored in /tmp
directory.

Email template format:
----------------------

to: <destination email address>
from: <source email address>
subject: <subject line>
[header: <additional header>]
<empty line>
<body>

The optional header line adds a freely configurable 
header to the mail. For example, the voicemail can be 
securely filtered for the header X-Content if the following 
is used in the voicemail template:
header: X-Content: Voicemail
This line is optional. 

Variables:
----------

If you want to customize the email depending on call datas, 
please use folowing syntax: %variable%

Following variables are supported:

 - %to% : local URI.
 - %domain% : local domain.
 - %user% : local user.
 - %email% : email address of the local user.

 - %from% : remote URI.
 - %from_user% : remote user.
 - %from_domain% : remote domain.