# acu_ss_retrieve_invoke

Invokes the call retrieve service.

#### Variant

ETS 300

#### Operation ID

ACU_OP_ID_RETRIEVE

#### OpType

ACU_OP_TYPE_INVOKE

#### Structure

struct acu_ss_retrieve_invoke
{
struct acu_ext_hdr ext_hdr; /* Extension header */
struct acu_ss_hdr ss_hdr; /* Supp. services header */
struct op_byte_field due_to_alternating; /* ON if alternating between */
}; /* connections */

#### Fields

The due_to_alternating field is optional. It can be set to ON or OFF. Set to ON if alternating between connections.