Call-Center Module
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   Table of Contents

   1. Admin Guide

        1.1. Overview
        1.2. How it works

              1.2.1. DB tables
              1.2.2. Call Flows
              1.2.3. Agents

        1.3. Dependencies

              1.3.1. OpenSIPS Modules
              1.3.2. External Libraries or Applications

        1.4. Exported Parameters

              1.4.1. db_url (string)
              1.4.2. acc_db_url (string)
              1.4.3. rt_db_url (string)
              1.4.4. b2b_scenario (string)
              1.4.5. b2b_scenario_agent (string)
              1.4.6. wrapup_time (integer)
              1.4.7. queue_pos_param (string)
              1.4.8. reject_on_no_agents (int)
              1.4.9. cc_agents_table (string)
              1.4.10. cca_agentid_column (string)
              1.4.11. cca_location_column (string)
              1.4.12. cca_skills_column (string)
              1.4.13. cca_logstate_column (string)
              1.4.14. cca_wrapuptime_column (string)
              1.4.15. cca_wrapupend_column (string)
              1.4.16. cc_flows_table (string)
              1.4.17. ccf_flowid_column (string)
              1.4.18. ccf_priority_column (string)
              1.4.19. ccf_skill_column (string)
              1.4.20. ccf_cid_column (string)
              1.4.21. ccf_max_wrapup_column (string)
              1.4.22. ccf_dissuading_hangup_column (string)
              1.4.23. ccf_dissuading_onhold_th_column (string)
              1.4.24. ccf_dissuading_ewt_th_column (string)
              1.4.25. ccf_dissuading_qsize_th_column (string)
              1.4.26. ccf_m_welcome_column (string)
              1.4.27. ccf_m_queue_column (string)
              1.4.28. ccf_m_dissuading_column (string)
              1.4.29. ccf_m_flow_id_column (string)

        1.5. Exported Functions

              1.5.1. cc_handle_call( flowID [,param])
              1.5.2. cc_agent_login(agentID, state)

        1.6. Exported Statistics

              1.6.1. Global statistics
              1.6.2. Per-flow statistics (one set for each flow)
              1.6.3. Per-agent statistics (one set for each agent)

        1.7. Exported MI Functions

              1.7.1. cc_reload
              1.7.2. cc_agent_login
              1.7.3. cc_list_queue
              1.7.4. cc_list_flows
              1.7.5. cc_list_agents
              1.7.6. cc_list_calls
              1.7.7. cc_reset_stats

        1.8. Exported Events

              1.8.1. E_CALLCENTER_AGENT_REPORT

        1.9. Exported Pseudo-Variables

   2. Developer Guide

        2.1. Available Functions

   3. Frequently Asked Questions
   4. Contributors

        4.1. By Commit Statistics
        4.2. By Commit Activity

   5. Documentation

        5.1. Contributors

   List of Tables

   4.1. Top contributors by DevScore^(1), authored commits^(2) and
          lines added/removed^(3)

   4.2. Most recently active contributors^(1) to this module

   List of Examples

   1.1. Set db_url parameter
   1.2. Set acc_db_url parameter
   1.3. Set rt_db_url parameter
   1.4. Set b2b_scenario parameter
   1.5. Set b2b_scenario_agent parameter
   1.6. Set wrapup_time parameter
   1.7. Set queue_pos_param parameter
   1.8. Set reject_on_no_agents parameter
   1.9. Set cc_agents_table parameter
   1.10. Set cca_agentid_column parameter
   1.11. Set cca_location_column parameter
   1.12. Set cca_skills_column parameter
   1.13. Set cca_logstate_column parameter
   1.14. Set cca_wrapuptime_column parameter
   1.15. Set cca_wrapupend_column parameter
   1.16. Set cc_flows_table parameter
   1.17. Set ccf_flowid_column parameter
   1.18. Set ccf_priority_column parameter
   1.19. Set ccf_skill_column parameter
   1.20. Set ccf_cid_column parameter
   1.21. Set ccf_max_wrapup_column parameter
   1.22. Set ccf_dissuading_hangup_column parameter
   1.23. Set ccf_dissuading_onhold_th_column parameter
   1.24. Set ccf_dissuading_ewt_th_column parameter
   1.25. Set ccf_dissuading_qsize_th_column parameter
   1.26. Set ccf_m_welcome_column parameter
   1.27. Set ccf_m_queue_column parameter
   1.28. Set ccf_m_dissuading_column parameter
   1.29. Set ccf_m_flow_id_column parameter
   1.30. cc_handle_call usage
   1.31. cc_agent_login usage

Chapter 1. Admin Guide

1.1. Overview

   The Call Center module implements an inbound call center system
   with call flows (for queuing the received calls) and agents
   (for answering the calls).

   The module implements the queuing system, the call distribution
   to agents, agents managements, CDRs for the calls, statistics
   on call distribution and agent's activity - basically
   everything except the media playback (for the queue). This part
   must be provided via a third party media server (FreeSwitch,
   Asterisk or others).

1.2. How it works

   The main entities in the modules are the flows (queues) and
   agents.

1.2.1. DB tables

   Each entity has a corresponding table in the database, for
   provisioning purposes - the cc_flows and cc_agents tables, see
   DB schema. Data is loaded at startup and cached into memory ;
   runtime reload is possible via the MI commands (see the
   cc_reload command in Exported MI Functions).

   Additionally there is a table cc_cdrs for writing the CDRs -
   this operation is done in realtime, after the call in
   completed, covering all possible cases: call was dropped while
   in queue, call was rejected by agent, call was accepted by
   agent, call terminated with error - NOTE that a call may
   generate more than one CDR (like call rejected by agent A, and
   redistributed and accepted by agent B).

   The cc_calls table is used to store ongoing calls, regardless
   it's state (in queue, to the agent, ended). It is populated at
   runtime by the module and queried at startup. This table should
   not be manually provisioned.

1.2.2. Call Flows

   A flow is defined by a unique alphanumerical ID - the main
   attribute of a flow is the skill - the skill is a capability
   required by the flow for an agent to be able to answer the call
   ; the concept of skills is the link between the flows and the
   agents - telling what agents are serving what flows - the flows
   require a skill, while the agents provide a set of skills.
   Agents matching the required skill of a flow will automatically
   receive calls from that flow.

   Additional, the flow has a priority - as agents may server
   multiple flows in the same time (based on skills), you can
   define priorities between the flows - if the flows has a higher
   priority, its calls will be pushed (in deliver to agents and
   queuing) in front of the calls from flows with a lower
   priority.

   Configurable per flow, the module may do per-flow call
   dissuading; this means to redirect a call to another
   destination, if the queue/flow is overloaded:
     * if the number of calls already in the queue exceeds the
       diss_qsize_th threshold
     * if the estimated time to wait of the queue exceeds the
       diss_ewt_th threshold
     * if the call was waiting in the queue for longer than
       diss_onhold_th threshold

   Optionally, the flow may define a prependcid - a prefix to be
   added to the CLI (Caller ID) when the call is delivered to the
   agents - as an agent may receive call from multiple flows, it
   is important for the user to see which was the queue a call was
   received.

   In terms of media announcements, the flow defines the
   message_welcome (optional, to be played in the call, before
   doing anything with the call) and message_queue (mandatory, the
   looping message providing infinite on hold media IMPORTANT -
   this message must cycle and media server must never hung up on
   it. Both announcements are provided as SIP URIs (where the call
   has to be sent in order to get the playback).

   The flow also has an optional max_wrapup time, which acts as an
   upper limit for the per-agent/global value (the flow forces a
   ceiling of the wrapup value for all its calls).

1.2.3. Agents

   An agent is defined by a unique alphanumerical ID - the main
   attribute of an agent is its the set of skills and its SIP
   location. The set of skills will tell what calls to be received
   (from which flows, based on the skill matching); the location
   is a SIP URI where to call must be sent in order to be answered
   by the agent.

   Additionally, the agent has a initial logstate - if he is
   logged in or not (being logged in is a must in order to receive
   calls). The log state may be changed at runtime via a dedicated
   MI command cc_agent_login, see Exported MI Functions.

   There is an optional per-agent wrapup_time defined, saying the
   time interval for an agent before getting a new call from the
   system (after he finished a call). If no value is defined for
   the agent, the global wrapup_time will be used. Note that the
   resulting value may be upper limited by the per-flow
   max_wrapup_time if defined.

1.3. Dependencies

1.3.1. OpenSIPS Modules

   The following modules must be loaded before this module:
     * b2b_logic - B2bUA module
     * database - one of the SQL DB modules

1.3.2. External Libraries or Applications

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

1.4. Exported Parameters

1.4.1. db_url (string)

   SQL address to the DB server -- database specific. This must be
   the Database holding the provisioning tables (cc_flows,
   cc_agents and cc_calls tables).
   If not explicitly set, the global OpenSIPS DB URL will be used.

   Example 1.1. Set db_url parameter
...
modparam("call_center", "db_url",
        "mysql://opensips:opensipsrw@localhost/opensips")
...

1.4.2. acc_db_url (string)

   SQL address to the DB server -- database specific. This must be
   the Database where the CDRs table (cc_cdrs) is located.
   If not explicitly set, the global OpenSIPS DB URL will be used.

   Example 1.2. Set acc_db_url parameter
...
modparam("call_center", "acc_db_url",
        "mysql://opensips:opensipsrw@localhost/opensips_cdrs")
...

1.4.3. rt_db_url (string)

   SQL address/URL of the DB server (database specific) where the
   runtime tables (non provisioning tables) are located. The
   runtime tables are the tables populated by OpenSIPS with data
   learned during runtime. To be more specific, the only runtime
   table we have so far is the "cc_calls" table.
   If not explicitly set, the global OpenSIPS DB URL will be used.

   Example 1.3. Set rt_db_url parameter
...
modparam("call_center", "rt_db_url",
        "mysql://opensips:opensipsrw@localhost/opensips_runtime")
...

1.4.4. b2b_scenario (string)

   The name of the B2B scenario that is used by the module for
   handling the calls in the queue. This is an advanced options
   and you should not change it unless you really understand what
   you are doing.

   The module provides an B2B scenario file
   scenario_callcenter.xml located in the module directory. The
   name of this scenario from this file (which must be loaded via
   the b2b_logic module) must match the b2b_scenario parameter.

   Default value is “call center”.

   Example 1.4. Set b2b_scenario parameter
...
modparam("b2b_logic", "script_scenario", "/etc/opensips/scenario_callcen
ter.xml")
modparam("call_center", "b2b_scenario", "call center")
...

1.4.5. b2b_scenario_agent (string)

   The name of the B2B scenario that is used by the module for
   handling the calls to agents, to announce the identity of the
   incoming call (as flow), before getting the actually
   distributed call. This is an advanced options and you should
   not change it unless you really understand what you are doing.

   The module provides an B2B scenario file scenario_agent.xml
   located in the module directory. The name of this scenario from
   this file (which must be loaded via the b2b_logic module) must
   match the b2b_scenario_agent parameter.

   Default value is “call center agent”.

   Example 1.5. Set b2b_scenario_agent parameter
...
modparam("b2b_logic", "script_scenario", "/etc/opensips/scenario_agent.x
ml")
modparam("call_center", "b2b_scenario_agent", "cc agent")
...

1.4.6. wrapup_time (integer)

   Time for an agent between finishing a call and receiving the
   next call from the system. Even if there are queued calls, the
   module will not deliver call to agent during this wrapup
   interval.

   This value may be overwritten by the per-agent value (if
   defined) and furher more, by the per-flow value (if defined).

   Default value is “30 seconds”.

   Example 1.6. Set wrapup_time parameter
...
modparam("call_center", "wrapup_time", 45)
...

1.4.7. queue_pos_param (string)

   The name of an SIP URI parameter to be used to report the
   position in the waiting queue when sending the call to media
   server for onwait/queue playback. The position 0 means it is
   the next call to be delivered to an agent.

   Default value is “empty(none)”.

   Example 1.7. Set queue_pos_param parameter
...
modparam("call_center", "queue_pos_param", "cc_pos")
...

1.4.8. reject_on_no_agents (int)

   A parameter to tell if an incoming call should be rejected or
   quueued if there are no logged in agents. Basically this allows
   call queueing on flows with no agents yet.

   Default value is “1 (true)”.

   Example 1.8. Set reject_on_no_agents parameter
...
modparam("call_center", "reject_on_no_agents", 0)
...

1.4.9. cc_agents_table (string)

   Name to be used for the table holding the agents.

   Default value is “cc_agents”.

   Example 1.9. Set cc_agents_table parameter
...
modparam("call_center", "cc_agents_table", "my_agents")
...

1.4.10. cca_agentid_column (string)

   Name to be used for the "agent id" (unique DB id) column in the
   agents table.

   Default value is “agentid”.

   Example 1.10. Set cca_agentid_column parameter
...
modparam("call_center", "cca_agentid_column", "cid")
...

1.4.11. cca_location_column (string)

   Name to be used for the "location" (SIP URI) column in the
   agents table.

   Default value is “agentid”.

   Example 1.11. Set cca_location_column parameter
...
modparam("call_center", "cca_location_column", "sip_uri")
...

1.4.12. cca_skills_column (string)

   Name to be used for the "skills" (list of skills) column in the
   agents table.

   Default value is “skills”.

   Example 1.12. Set cca_skills_column parameter
...
modparam("call_center", "cca_skills_column", "skills")
...

1.4.13. cca_logstate_column (string)

   Name to be used for the "logstate" (original login state)
   column in the agents table.

   Default value is “logstate”.

   Example 1.13. Set cca_logstate_column parameter
...
modparam("call_center", "cca_logstate_column", "log_state")
...

1.4.14. cca_wrapuptime_column (string)

   Name to be used for the "wrapuptime" (per-agent wrapup time)
   column in the agents table.

   Default value is “wrapup_time”.

   Example 1.14. Set cca_wrapuptime_column parameter
...
modparam("call_center", "cca_wrapuptime_column", "wtime")
...

1.4.15. cca_wrapupend_column (string)

   Name to be used for the "wrapupend" (timestamp when the wrapup
   ends) column in the agents table.

   Default value is “wrapup_end_time”.

   Example 1.15. Set cca_wrapupend_column parameter
...
modparam("call_center", "cca_wrapupend_column", "wrapup_ends")
...

1.4.16. cc_flows_table (string)

   Name to be used for the table holding the definition of the
   flows/queues.

   Default value is “cc_flows”.

   Example 1.16. Set cc_flows_table parameter
...
modparam("call_center", "cc_flows_table", "queues")
...

1.4.17. ccf_flowid_column (string)

   Name to be used for the "flow id" (unique DB id) column in the
   flows table.

   Default value is “flowid”.

   Example 1.17. Set ccf_flowid_column parameter
...
modparam("call_center", "ccf_flowid_column", "queue_id")
...

1.4.18. ccf_priority_column (string)

   Name to be used for the "priority" column in the flows table.

   Default value is “priority”.

   Example 1.18. Set ccf_priority_column parameter
...
modparam("call_center", "ccf_priority_column", "queue_prio")
...

1.4.19. ccf_skill_column (string)

   Name to be used for the "skill" column in the flows table.

   Default value is “skill”.

   Example 1.19. Set ccf_skill_column parameter
...
modparam("call_center", "ccf_skill_column", "queue_skill")
...

1.4.20. ccf_cid_column (string)

   Name to be used for the "caller ID prefix" column in the flows
   table.

   Default value is “prependcid”.

   Example 1.20. Set ccf_cid_column parameter
...
modparam("call_center", "ccf_cid_column", "queue_cli_prefix")
...

1.4.21. ccf_max_wrapup_column (string)

   Name to be used for the "max limit for wrapup time" column in
   the flows table.

   Default value is “max_wrapup_time”.

   Example 1.21. Set ccf_max_wrapup_column parameter
...
modparam("call_center", "ccf_max_wrapup_column", "queue_wrapup")
...

1.4.22. ccf_dissuading_hangup_column (string)

   Name to be used for the "hangup after dissuading" column in the
   flows table.

   Default value is “dissuading_hangup”.

   Example 1.22. Set ccf_dissuading_hangup_column parameter
...
modparam("call_center", "ccf_dissuading_hangup_column", "hangup_on_dissu
ading")
...

1.4.23. ccf_dissuading_onhold_th_column (string)

   Name to be used for the "on-hold dissuading threshold" column
   in the flows table.

   Default value is “dissuading_onhold_th”.

   Example 1.23. Set ccf_dissuading_onhold_th_column parameter
...
modparam("call_center", "ccf_dissuading_onhold_th_column", "th_diss_onho
ld")
...

1.4.24. ccf_dissuading_ewt_th_column (string)

   Name to be used for the "EWT dissuading threshold" column in
   the flows table.

   Default value is “dissuading_ewt_th”.

   Example 1.24. Set ccf_dissuading_ewt_th_column parameter
...
modparam("call_center", "ccf_dissuading_ewt_th_column", "th_diss_ewt")
...

1.4.25. ccf_dissuading_qsize_th_column (string)

   Name to be used for the "queue size dissuading threshold"
   column in the flows table.

   Default value is “dissuading_qsize_th”.

   Example 1.25. Set ccf_dissuading_qsize_th_column parameter
...
modparam("call_center", "ccf_dissuading_qsize_th_column", "th_diss_qsize
")
...

1.4.26. ccf_m_welcome_column (string)

   Name to be used for the "audio message on welcome" column in
   the flows table.

   Default value is “message_welcome”.

   Example 1.26. Set ccf_m_welcome_column parameter
...
modparam("call_center", "ccf_m_welcome_column", "audio_welcome")
...

1.4.27. ccf_m_queue_column (string)

   Name to be used for the "audio message on queueing" column in
   the flows table.

   Default value is “message_queue”.

   Example 1.27. Set ccf_m_queue_column parameter
...
modparam("call_center", "ccf_m_queue_column", "audio_queue")
...

1.4.28. ccf_m_dissuading_column (string)

   Name to be used for the "audio message on dissuading" column in
   the flows table.

   Default value is “message_dissuading”.

   Example 1.28. Set ccf_m_dissuading_column parameter
...
modparam("call_center", "ccf_m_dissuading_column", "audio_dissuading")
...

1.4.29. ccf_m_flow_id_column (string)

   Name to be used for the "audio message on identifying the flow"
   column in the flows table.

   Default value is “message_flow_id”.

   Example 1.29. Set ccf_m_flow_id_column parameter
...
modparam("call_center", "ccf_m_flow_id_column", "audio_flow_id")
...

1.5. Exported Functions

1.5.1.  cc_handle_call( flowID [,param])

   This must be used only for initial INVITE requests - the
   function pushes the call to be handled by the call center
   module (via a certain flow/queue).

   This function can be used from REQUEST_ROUTE.

   Parameters:
     * flowID (string) - the ID of the flow to handle this call
       (push the call to that flow).
     * param (string, optional) - an opaque string to be passed as
       parameter to the "callcenter" and "agent" B2B scenarios. It
       is intended for custom integration of the call center
       module and it is 100% up to the script writer about the
       value and purpose of this parameter, OpenSIPS will not
       touch or interpret it.

   The function returns TRUE back to the script if the call was
   successfully pushed and handled by the Call Center engine.
   IMPORTANT: you must not do any signaling on the call (reply,
   relay) after this point.

   In case of error, FALSE is returned to the script with the
   following return codes:
     * -1 - unable to get the flow ID from the parameter;
     * -2 - unable to parse the FROM URI;
     * -3 - flow with FlowID not found;
     * -4 - no agents logged in the flow;
     * -5 - internal error;

   Example 1.30. cc_handle_call usage
...
if (is_method("INVITE") and !has_totag()) {
        if (!cc_handle_call("tech_support")) {
                send_reply(403,"Cannot handle call");
                exit;
        }
}
...

1.5.2.  cc_agent_login(agentID, state)

   This function sets the login (on or off) state for an agent.

   This function can be used from REQUEST_ROUTE.

   Parameters:
     * agentID (string) - the ID of the agent
     * state (int) - an integer value giving the new state - 0
       means logged off, anything else means logged in.

   Example 1.31. cc_agent_login usage
...
# log off the 'agentX' agent
cc_agent_login("agentX",0);
...

1.6. Exported Statistics

1.6.1. Global statistics

1.6.1.1. ccg_incalls

   Total number of received calls. (counter type)

1.6.1.2. ccg_awt

   Global avg. waiting time for calls. (realtime type)

1.6.1.3. ccg_load

   Global load (across all flows). (realtime type)

1.6.1.4. ccg_distributed_incalls

   Total number of distributed calls. (counter type)

1.6.1.5. ccg_answered_incalls

   Total number of calls answered by agents. (counter type)

1.6.1.6. ccg_abandonned_incalls

   Total number of calls terminated by caller before being
   answered by agents. (counter type)

1.6.1.7. ccg_onhold_calls

   Total number of calls in the queues (onhold). (realtime type)

1.6.1.8. ccg_free_agents

   Total number of free agents (across all flows). (realtime type)

1.6.2. Per-flow statistics (one set for each flow)

1.6.2.1. ccf_incalls_flowID

   Number of received calls for the flow. (counter type)

1.6.2.2. ccf_dist_incalls_flowID

   Number of distributed calls in this flow. (counter type)

1.6.2.3. ccf_answ_incalls_flowID

   Nnumber of calls from the flow answered by agents. (counter
   type)

1.6.2.4. ccf_aban_incalls_flowID

   Number of calls (from the flow) terminated by caller before
   being answered by agents. (counter type)

1.6.2.5. ccf_onhold_incalls_flowID

   Number of calls (from the flow) which were put onhold. (counter
   type)

1.6.2.6. ccf_queued_calls_flowID

   Number of calls which are queued for this flow. (realtime type)

1.6.2.7. ccf_free_agents_flowID

   Number of free agents serving this flow. (realtime type)

1.6.2.8. ccf_etw_flowID

   Estimated Time to Wait for this flow. (realtime type)

1.6.2.9. ccf_awt_flowID

   Avg. Wating Time for this flow. (realtime type)

1.6.2.10. ccg_load_flowID

   The load on the flow (number of queued calls versus number of
   logged agents). (realtime type)

1.6.3. Per-agent statistics (one set for each agent)

1.6.3.1. cca_dist_incalls_agnetID

   Number of distributed calls to this agent. (counter type)

1.6.3.2. cca_answ_incalls_agentID

   Nnumber of calls answered by the agent. (counter type)

1.6.3.3. cca_aban_incalls_agentID

   Number of calls (sent to this agent) terminated by caller
   before being answered by agents. (counter type)

1.6.3.4. cca_att_agentID

   Avg. Talk Time for this agent (realtime type)

1.7. Exported MI Functions

1.7.1.  cc_reload

   Command to reload flows and agents definition from database.

   It takes no parameter.

   MI FIFO Command usage:
opensips-cli -x mi cc_reload

1.7.2.  cc_agent_login

   Command to login an agent into the Call Center engine.

   Parameters:
     * agent_id - ID of the agent
     * state - the new login state (0 - log off, 1 - log in)

   MI FIFO Command usage:
opensips-cli -x mi cc_agent_login agentX 0

1.7.3.  cc_list_queue

   Command to list all the calls in queuing - for each call, the
   following attributes will be printed: the flow of the call, for
   how long the call is in the queue, the ETW for the call, call
   priority and the call skill (inherited from the flow).

   It takes no parameter.

   MI FIFO Command usage:
opensips-cli -x mi cc_list_queue

1.7.4.  cc_list_flows

   Command to list all the flows - for each flow, the following
   attributes will be printed: the flow ID, the avg. call
   duration, how many calls were processed, how many agents are
   logged, and how many onging calls are.

   It takes no parameter.

   MI FIFO Command usage:
opensips-cli -x mi cc_list_flows

1.7.5.  cc_list_agents

   Command to list all the agents - for each agent, the following
   attributes will be printed: agent ID, agent login state and
   agent state (free, wrapup, incall).

   It takes no parameter.

   MI FIFO Command usage:
opensips-cli -x mi cc_list_agents

1.7.6.  cc_list_calls

   Command to list all the ongoing calls - for each call, the
   following attributes will be printed: call ID, call state
   (welcome, queued, toagent, ended), call duration, flow it
   belongs to, agent serving the call (if any).

   It takes no parameter.

   MI FIFO Command usage:
opensips-cli -x mi cc_list_agents

1.7.7.  cc_reset_stats

   Command to reset all counter-like statistics.

   It takes no parameter.

   MI FIFO Command usage:
opensips-cli -x mi cc_reset_stats

1.8. Exported Events

1.8.1.  E_CALLCENTER_AGENT_REPORT

   This event is raised when the status of an agent changes.

   Parameters:
     * agent_id - the id of the agent.
     * state - the status of the agent:
          + offline
          + free
          + incall
          + wrapup
     * wrapup_ends - the timestamp when the wrapup state will end;
       published only if the state is "wrapup"
     * flow_id - the flow ID that delivered the call for this
       agent; published only if the state is "incall"

1.9. Exported Pseudo-Variables

   NONE

Chapter 2. Developer Guide

2.1. Available Functions

   NONE

Chapter 3. Frequently Asked Questions

   3.1.

       Where can I find more about OpenSIPS?

       Take a look at https://opensips.org/.

   3.2.

       Where can I post a question about this module?

       First at all check if your question was already answered on one
       of our mailing lists:
         * User Mailing List -
           http://lists.opensips.org/cgi-bin/mailman/listinfo/users
         * Developer Mailing List -
           http://lists.opensips.org/cgi-bin/mailman/listinfo/devel

       E-mails regarding any stable OpenSIPS release should be sent to
       <users@lists.opensips.org> and e-mails regarding development
       versions should be sent to <devel@lists.opensips.org>.

       If you want to keep the mail private, send it to
       <users@lists.opensips.org>.

   3.3.

       How can I report a bug?

       Please follow the guidelines provided at:
       https://github.com/OpenSIPS/opensips/issues.

Chapter 4. Contributors

4.1. By Commit Statistics

   Table 4.1. Top contributors by DevScore^(1), authored
   commits^(2) and lines added/removed^(3)
     Name DevScore Commits Lines ++ Lines --
   1. Bogdan-Andrei Iancu (@bogdan-iancu) 78 28 5558 198
   2. Razvan Crainea (@razvancrainea) 36 27 672 146
   3. Liviu Chircu (@liviuchircu) 14 11 72 89
   4. Vlad Patrascu (@rvlad-patrascu) 14 7 265 240
   5. Peter Lemenkov (@lemenkov) 4 2 1 1
   6. Vlad Paiu (@vladpaiu) 3 1 13 4
   7. Dusan Klinec 3 1 1 1
   8. Zero King 3 1 1 1

   (1) DevScore = author_commits + author_lines_added /
   (project_lines_added / project_commits) + author_lines_deleted
   / (project_lines_deleted / project_commits)

   (2) including any documentation-related commits, excluding
   merge commits. Regarding imported patches/code, we do our best
   to count the work on behalf of the proper owner, as per the
   "fix_authors" and "mod_renames" arrays in
   opensips/doc/build-contrib.sh. If you identify any
   patches/commits which do not get properly attributed to you,
   please submit a pull request which extends "fix_authors" and/or
   "mod_renames".

   (3) ignoring whitespace edits, renamed files and auto-generated
   files

4.2. By Commit Activity

   Table 4.2. Most recently active contributors^(1) to this module
                     Name                   Commit Activity
   1. Liviu Chircu (@liviuchircu)         Jun 2014 - May 2020
   2. Bogdan-Andrei Iancu (@bogdan-iancu) Mar 2014 - Apr 2020
   3. Razvan Crainea (@razvancrainea)     Mar 2014 - Apr 2020
   4. Zero King                           Mar 2020 - Mar 2020
   5. Vlad Patrascu (@rvlad-patrascu)     May 2017 - Mar 2020
   6. Peter Lemenkov (@lemenkov)          Jun 2018 - Sep 2018
   7. Dusan Klinec                        Dec 2015 - Dec 2015
   8. Vlad Paiu (@vladpaiu)               Mar 2014 - Mar 2014

   (1) including any documentation-related commits, excluding
   merge commits

Chapter 5. Documentation

5.1. Contributors

   Last edited by: Bogdan-Andrei Iancu (@bogdan-iancu), Razvan
   Crainea (@razvancrainea), Zero King, Vlad Patrascu
   (@rvlad-patrascu), Peter Lemenkov (@lemenkov), Liviu Chircu
   (@liviuchircu).

   Documentation Copyrights:

   Copyright © 2014 www.opensips-solutions.com
