# ACU_SERVICE_CO

This topic describes:

- ACU_SERVICE_CO protocol variants

- ACU_SERVICE_CO macro descriptions and Q.931 IE

#### Purpose

Indicates that a SERVICE ACKNOWLEDGE message has been received.

#### Conn_id

Unused.

## ACU_SERVICE_CO protocol variants

The following table lists the variants under which each macro is supported for this primitive. In this table, x indicates both NT and TE sides.

Macro | 4 E S S | E 1 0 | N I 2 | D M S | E T S I | V N 6 | H K G | A U S T E L 1 | N T T | K O R E A | T A I W A N | Q S I G | D P N S S | T 1 6 0 7
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Acu_service_pref (interface) |  | x |  |  |  |  |  |  |  |  |  |  |  |
Acu_service_pref (B channel) | x | x | x | x |  |  |  |  |  |  |  |  |  | x
Acu_service_int_id | x |  | x | x |  |  |  |  |  |  |  |  |  | x
Acu_service_b_chan | x |  | x | x |  |  |  |  |  |  |  |  |  | x
Acu_service_status | x |  | x | x |  |  |  |  |  |  |  |  |  | x
Acu_service_action_type | x |  | x | x |  |  |  |  |  |  |  |  |  | x
Acu_service_q931_size |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acu_service_size |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acu_service_a_q931 |  |  |  |  |  |  |  |  |  |  |  |  |  |

## ACU_SERVICE_CO macro descriptions and Q.931 IE

Macro | Description | Q.931 IE
--- | --- | ---
Acu_service_pref | Preference. Valid values include: I_PREF_INTERFACE I_PREF_B_CHANNEL | Channel identification
Acu_service_int_id | Interface ID. | Channel identification
Acu_service_b_chan | B channel (if Acu_service_pref = I_PREF_B_CHANNEL). | Channel identification
Acu_service_status | New status. Valid values include: I_B_CHAN_IN_SERVICE I_B_CHAN_OUT_OF_SERVICE | Change status. This IE is not defined in Q.931.
Acu_service_action_type | Action to be performed (maintenance only). | Not applicable.
Acu_service_q931_size | Reserved for future use. | Not applicable.
Acu_service_size | Size of structure. | Not applicable.
Acu_service_a_q931 | Reserved for future use. | Not applicable.