• AOC at start of call (AOC-S). With AOC-S, the user side is notified of the cost of a call when the call is started. This information can take the form of a flat rate currency cost, the cost on a time basis, or the cost based on pre- arranged item numbers.

• AOC during the call (AOC-D). AOC-D provides the user with information about cost of the call during the call. For example, a subtotal of the cost could be sent to the user on an interval basis.

• AOC at the end of the call (AOC-E). AOC-E provides the user side with the total cost of the call, at the time the call is cleared (or later).

Note: The basic call signaling over the network is affected by AOC services. In call clearing cases, the call clearing procedure will be delayed until AOC signaling is completed.

• Operation ID ACU_OP_ID_AOC_REQUEST

• OpType ACU_OP_TYPE_INVOKE (See Figure 42.)

struct acu_ss_aoc_request_invoke
{
  struct acu_ext_hdr ext_hdr; /* Extension header               */
  struct acu_ss_hdr  ss_hdr;  /* Supp. services header          */
  uchar              aoc_s;   /* Request AOC-S services (ON/OFF)*/
  uchar              aoc_d;   /* Request AOC-D services (ON/OFF)*/
  uchar              aoc_e;   /* Request AOC-E services (ON/OFF)*/
  pad5
};

Field	Description	Must be filled in this request?
aoc_s	Request activation of AOC-S Services (ON/OFF)	Yes
aoc_d	Request activation of AOC-D Services (ON/OFF)	Yes
aoc_e	Request activation of AOC-E Services (ON/OFF)	Yes

• Operation ID ACU_OP_ID_AOC_REQUEST

• OpType ACU_OP_TYPE_RETRES (See Figure 42.)

struct acu_ss_aoc_request_ret_result
{
  struct acu_ext_hdr ext_hdr; /* Extension header              */
  struct acu_ss_hdr  ss_hdr;  /* Supp. services header         */
  uchar              aoc_s;   /* AOC-S services active (ON/OFF)*/
  uchar              aoc_d;   /* AOC-D services active (ON/OFF)*/
  uchar              aoc_e;   /* AOC-E services active (ON/OFF)*/
  pad5
};

Field	Description	Will be filled in this response?
aoc_s	(ON/OFF) AOC-S Services active/inactive.	Yes
aoc_d	(ON/OFF) AOC-D Services active/inactive.	Yes
aoc_e	(ON/OFF) AOC-E Services active/inactive.	Yes

• Operation ID ACU_OP_ID_AOC_REQUEST

• OpType ACU_OP_TYPE_RETERR

struct acu_ss_aoc_request_ret_error
{
  struct acu_ext_hdr ext_hdr; /* Extension header                       */
  struct acu_ss_hdr  ss_hdr;  /* Supp. services header                  */
  ushort             cause;   /* From ACU_SS_AOC_ERR.. constants        */
  uchar              aoc_s;   /* Error applies to AOC-S service (ON/OFF)*/
  uchar              aoc_d;   /* Error applies to AOC-D service (ON/OFF)*/
  uchar              aoc_e;   /* Error applies to AOC-E service (ON/OFF)*/
  pad3
};

Field	Description	Will be filled in this response?
cause	Error cause. From SS_AOC_ERR constants.	Yes
aoc_s	(ON/OFF) Error in AOC-S services.	Yes
aoc_d	(ON/OFF) Error in AOC-D services.	Yes
aoc_e	(ON/OFF) Error in AOC-E services.	Yes

• Operation ID ACU_OP_ID_AOC_INFORM

• OpType ACU_OP_TYPE_INVOKE

struct acu_ss_aoc_inform_invoke
{
  struct acu_ext_hdr ext_hdr; /* Extension header                  */
  struct acu_ss_hdr  ss_hdr;  /* Supp. services header             */
  uchar  aoc_type;            /* From ACU_SS_AOC_TYPE... constants */
  pad7
  union
  {
    tAcuSSAocSInform aoc_s;   /* aoc_type==AOC_SS_TYPE_AOC_S_INFORM*/
    tAcuSSAocDInform aoc_d;   /* aoc_type==AOC_SS_TYPE_AOC_D_INFORM*/
    tAcuSSAocEInform aoc_e;   /* aoc_type==AOC_SS_TYPE_AOC_E_INFORM*/
  } aoc_data;
};

Field	Description	Will be filled in this response?
aoc_type	Indicates the type of AOC service returning the data.. From SS_AOC_TYPE constants.	Yes
aoc_data	aoc_s contains data if aoc_type= ACU_SS_AOC_TYPE_AOC_S_INFORM aoc_d contains data if aoc_type= ACU_SS_AOC_TYPE_AOC_D_INFORM aoc_e contains data if aoc_type= ACU_SS_AOC_TYPE_AOC_E_INFORM	Yes

typedef struct tAcuSSAocSInform
{
  uchar type_of_info;           /* From ACU_SS_AOC_TYPE_OF_INFO_ constants*/
  uchar charged_item;           /* Bitmap of charged item constants       */
  uchar charging_rate;          /* One of charging rate constants         */
  pad5
  union 
  {
    tAcuSSAocDuration duration; /* charging_rate=CHARGING_RATE_DURATION   */
    tAcuSSAocSpecific specific; /* charging_rate=CHARGING_RATE_SPECIFIC   */
    tAcuSSAocVolume   volume;   /* charging_rate=CHARGING_RATE_VOLUME     */
  }rate;
};

Field	Included	Description
type_of_info	Mandatory	From SS_AOC_TYPE_OF_INFO constants.
charge_item	Optional	Bitmap of charged item constants. From SS_AOC_CHARGED_ITEM constants.
charging_rate	Optional	One of SS_AOC_CHARGING_RATE constants.
rate	Optional	References structure containing data associated with charging rate.

Value	Description
BASIC	Indicates the basic communication charged item. This charged item indicates the rate to be applied to the basic communication between the users. If the rate changes, the served user is informed by a repetition of this charged item indicating the new rate.
ATTEMPT	Indicates the call attempt charged item. This charged item indicates the cost applied for successful call attempt before the called user accepts the call.
SETUP	Indicates the call setup charged item. This charged item indicates the cost applied when the connection between the users is established.
SPECIAL	Indicates the special charging arrangement charged item. This charged item indicates that a special arrangement exists for calculating the cost of the call. Note that the use of this charged item is not standardized: its meaning is a matter for the network operator and the user to which it is sent.
USER_TO_USER	Indicates the user-to-user information transfer charged item. This charged item indicates the rate to be applied to the transfer of user-to-user information. If the rate changes, the served user is informed by a repetition of this charged item indicating the new rate.
SUP_SERV	Indicates the operation of supplementary services charged item. This charged item indicates the cost applied for the operation of requested supplementary services.

Note: Network providers will only use those charged items which are appropriate to that service provider's charging mechanism. Thus, in some networks, users may or may not receive some of these items or combinations of items. Different networks may give information about the same call in different ways.

Charged Item	Included	Possible Charging Rate Values
Basic Communication	Always.	Price per time unit and time unit. Flat rate (a fixed currency value per event). Free of charge. Special charging code. Not available.
Call Attempt	Only in the initial charging information sent to the served user.	Flat rate (a fixed currency value per event). Free of charge. Special charging code. Not available.
Call Setup	Only in the initial charging information sent to the served user.	Flat rate (a fixed currency value per event). Free of charge. Special charging code. Not available.
Operation of Supplementary Services	Only if the served user has requested a supplementary service.	Price per time unit and time unit. Flat rate (a fixed currency value per event). Free of charge. Special charging code. Not available.
User-to-User Information Transfer	Only if the served user has requested the user-to-user signaling supplementary service.	Price per volume unit and volume unit. Flat rate (a fixed currency value per event). Free of charge. Special charging code. Not available.

• tAcuSSAocDuration: provides the currency value for a particular time unit, and the length of the time unit.

• tAcuSSAocVolume: provides the currency value for a particular volume unit, and the length of the volume unit.

• tAcuSSAocSpecific: provides a specific currency value.

Rate Type	charging_rate field setting	Associated Data Structure	Structure Description
Price per volume unit and volume unit	VOLUME	tAcuSSAocVolume	Currency value for a particular volume unit, together with the length of the volume unit.
Price per time unit and time unit	DURATION	tAcuSSAocDuration	Currency value for a particular time unit, together with the length of the time unit.
Flat rate	SPECIFIC	tAcuSSAocSpecific	A fixed currency value per event. rate_type in this structure is set to FLAT_RATE.
Free of charge	SPECIFIC	tAcuSSAocSpecific	A fixed currency value per event. rate_type in this structure is set to FREE_OF_CHARGE or FREE_OF_CHARGE_FROM_ BEGINNING.
Special charging code	SPECIFIC	tAcuSSAocSpecific	A fixed currency value per event. rate_type in this structure is set to SPECIAL_CHARGING.
Not available	SPECIFIC	tAcuSSAocSpecific	rate_type in this structure is set to NOT_AVAIL.

typedef struct tAcuSSAocDuration
{
  struct op_byte_field multiplier;        /* Applies to currency amount   */
  struct op_long_field currency_amount;   /* No. of currency units charged*/
  struct op_long_field time;              /* Number of time units charged */
  struct op_long_field granularity;       /* Integer or not included      */
  struct op_byte_field time_scale;        /* Applies to time              */
  struct op_byte_field granularity_scale; /* Applies to granularity       */
  struct op_byte_field currency_id_size;  /* 0 if currency ID not included*/
  uchar  currency_id[MAX_CURRENCY_SIZE];  /* Currency ID                  */
  uchar  type_of_charging;                /* From SS_AOC_S_TYPE_OF_CHARGE */
  pad3                                    /* constants                    */
};

typedef struct tAcuSSAocSpecific
{
  struct op_byte_field multiplier;       /* From ACU_SS_AOC_MULTIPLIER_  */
                                         /* constants                    */
  struct op_long_field currency_amount;  /* No. of currency units charged*/
  struct op_byte_field charge_code;      /* 10                           */
  struct op_byte_field currency_id_size; /* No. of bytes from currency_id*/
  uchar  currency_id[MAX_CURRENCY_SIZE]; /* Currency ID string           */
  uchar  rate_type;                      /* From ACU_SS_AOC_RATE_TYPE_   */
  pad3                                   /* constants                    */
};

Field	Included	Description
multiplier	Mandatory	Yes when rate_type is FLAT_RATE. This value plus currency_amount indicate the currency amount. From ACU_SS_AOC_MULTIPLIER constants.
currency_amount	Mandatory	Yes when rate_type is FLAT_RATE. This value plus multiplier indicate the currency amount. Raw numeric value.
charge_code	Mandatory	Yes when rate_type is SPECIAL_CHARGING. Integer value from 1 to 10. Identifies special charge arrangement for the NAI.
currency_id_size	Mandatory	Number of bytes from currency_id.
currency_id[MAX_ CURRENCY_SIZE]	Mandatory	Character array identifying the currency.
rate_type	Mandatory	Free of charge, flat rate (a fixed currency value per event), special charging code, or not available. From ACU_SS_AOC_RATE_TYPE constants.

typedef struct tAcuSSAocVolume
{
  struct op_long_field currency_amount;    /* No of currency units charged*/
  struct op_byte_field currency_id_size;   /* No of bytes from currency_id*/
  struct op_byte_field multiplier;         /* From ACU_SS_AOC_MULTIPLIER_ */
                                           /* constants*                   /
  uchar    currency_id[MAX_CURRENCY_SIZE]; /* Currency ID string          */
  uchar    volume_type;                    /* From ACU_SS_AOC_VOLUME_TYPE_*/
  pad3                                     /* constants                   */
};

Field	Included	Description
currency_amount	Mandatory	This value plus multiplier indicates the currency amount. Raw numeric value.
currency_id_size	Mandatory	Number of bytes from currency_id.
multiplier	Mandatory	This value plus currency_amount indicates the currency amount. From ACU_SS_AOC_MULTIPLIER constants.
currency_id[MAX_ CURRENCY_SIZE]	Mandatory	Character array identifying the currency.
volume_type	Mandatory	Octet, segment, or message to which UUI has been attached. From ACU_SS_AOC_VOLUME_TYPE constants.

typedef struct tAcuSSAocDInform
{
  struct op_byte_field currency_id_size; /* Used only if type_of_charging*/
                                         /* is CURRENCY_UNITS            */
  struct op_long_field currency_amount;  /* Used only if type_of_charging*/
                                         /* is CURRENCY_UNITS            */
  struct op_byte_field multiplier;       /* Used only if type_of_charging*/
                                         /* is CURRENCY_UNITS            */
  struct op_byte_field billing_id;       /* From ACU_SS_AOC_BILLING_ID   */
                                         /* constants                    */
  struct acu_ss_association charge_association; /* Returns ID of charge  */
                                         /* for AOC-E after call clearing*/
  tRecordedUnits       recorded_units;   /* Used only if type_of_charging*/
                                         /* is CHARGING_UNITS            */
  uchar currency_id[MAX_CURRENCY_SIZE];  /* Used only if type_of_charging*/
                                         /* is CURRENCY_UNITS            */
  uchar type_of_charging;                /* From SS_AOC_TYPE_OF_CHARGE...*/
                                         /* constants                    */
  uchar recorded_charges;                /* From SS_AOC_RECORDED_CHARGES */
                                         /* constants                    */
  uchar completed;                       /* Set to OFF if additional     */
                                         /* recorded units are queued    */
  pad1                                   /* in a subsequent message      */
};

Field	Description
currency_id_size	Size of currency_id. Used only if type_of_charging is CURRENCY_UNITS.
currency_amount	This value plus multiplier indicates the currency amount. Used only if type_of_charging is CURRENCY_UNITS.
multiplier	This value plus currency_amount indicates the currency amount. From ACU_SS_AOC_MULTIPLIER constants. Used only if type_of_charging is CURRENCY_UNITS.
billing_id	From ACU_SS_AOC_BILLING_ID constants.
charge_association	Currently not used.
recorded_units	Used only if type_of_charging is CHARGING_UNITS.
currency_id[MAX_ CURRENCY_SIZE]	Currency ID. Used only if type_of_charging is CURRENCY_UNITS.
type_of_charging	Step function (charge is incurred for the time unit, or part thereof) or continuous (charges are incurred evenly throughout). From SS_AOC_S_TYPE_OF_CHARGE constants.
recorded_charges	From SS_AOC_RECORDED_CHARGES constants.
completed	Set to OFF if additional recorded units are queued in a subsequent message.

typedef struct tAcuSSAocEInform
{
  struct op_byte_field currency_id_size;/* Used only if type_of_charging*/
                                        /* is CURRENCY_UNITS            */
  struct op_long_field currency_amount; /* Used only if type_of_charging*/
                                        /* is CURRENCY_UNITS            */
  struct op_byte_field multiplier;      /* Used only if type_of_charging*/
                                        /* is CURRENCY_UNITS            */
  struct op_byte_field billing_id;      /* From ACU_SS_AOC_BILLING_ID   */
                                        /* constants                    */
  struct acu_ss_association charge_association; /* Returns ID of charge */
                                        /* for AOC-E after call clearing*/
  tRecordedUnits       recorded_units;  /* Used only if type_of_charging*/
                                        /* is CHARGING_UNITS            */
  uchar currency_id[MAX_CURRENCY_SIZE]; /* Used only if type_of_charging*/
                                        /* is CURRENCY_UNITS            */
  uchar type_of_charging;               /* From SS_AOC_TYPE_OF_CHARGE...*/
                                        /* constants                    */
  uchar recorded_charges;               /* From SS_AOC_RECORDED_CHARGES */
                                        /* constants                    */
  uchar completed;                      /* Set to OFF if additional     */
                                        /* recorded units are queued    */
  pad1                                  /* in a subsequent message      */
};

Field	Description
currency_id_size	Size of currency_id. Used only if type_of_charging is CURRENCY_UNITS.
currency_amount	This value plus multiplier indicates the currency amount. Used only if type_of_charging is CURRENCY_UNITS.
multiplier	This value plus currency_amount indicates the currency amount. From ACU_SS_AOC_MULTIPLIER constants. Used only if type_of_charging is CURRENCY_UNITS.
billing_id	From ACU_SS_AOC_BILLING_ID constants.
charge_association	Currently not used.
recorded_units	Used only if type_of_charging is CHARGING_UNITS.
currency_id[MAX_ CURRENCY_SIZE]	Currency ID. Used only if type_of_charging is CURRENCY_UNITS.
type_of_charging	Step function (charge is incurred for the time unit, or part thereof) or continuous (charges are incurred evenly throughout). From SS_AOC_S_TYPE_OF_CHARGE constants.
recorded_charges	From SS_AOC_RECORDED_CHARGES constants.
completed	Set to OFF if additional recorded units are queued in a subsequent message.

• aoc_s_presubscribed

• aoc_d_presubscribed

• aoc_e_presubscribed