Nature of connection indicators

Associated variants: All

Contains information sent in the forward direction with information regarding the circuit connection desired to enable intermediate exchanges to determine how to process a call.

typedef struct _natConInd     /* Nature of Connection Ind.     */
{
    ElmtHdr eh;               /* element header                */
    TknU8   satInd;           /* Satellite Indicator           */
    TknU8   contChkInd;       /* continuity check indicator    */
    TknU8   echoCntrlDevInd;  /* echo control device indicator */
    TknU8 spare;
 SiNatConInd;

The fields in the SiNatConInd structure are encoded as follows:

Field

Value

satInd

Satellite indicator. Defined values:

0x00 = SAT_NONE:   No satellite circuit in the connection

0x01 = SAT_ONE   One satellite circuit in the connection

0x02 = SAT_TWO   Two satellite circuits in the connection

contChkInd

Continuity check indicator. Defined values for all supported variants except BICC:

0x00 = CONTCHK_NOTREQ   Continuity check not required

0x01 = CONTCHK_REQ   Continuity check not required on this circuit

0x02 = CONTCHK_PREV   Continuity check performed on a previous circuit

0x03 = CONTCHK_SPARE   Spare

 

Defined values for BICC:

0x00 = CONT_NOTEXP   No COT expected

0x01 = CONT_RSRVD   Reserved

0x02 = CONT_EXP   COT expected

echoCntrlDevInd

Echo control device indicator. Defined values:

0x00 = ECHOCDEV_NOTINCL   Outgoing echo control device not included.

0x01 = ECHOCDEV_INCL   Outgoing echo control device included


Tokens for the ANSI, BICC, and ETSI variants

Token

ANSI 88

ANSI 92

ANSI 95

BICC

ETSI V2

ETSI V3

satInd

*

*

*

*

*

*

contChkInd

*

*

*

*

*

*

echoCntrlDevInd

*

*

*

*

*

*

spare

F-H

F-H

F-H

F-H

F-H

F-H


Tokens for the ITU and Q.767 variants

Token

ITU Blue

ITU White

ITU 97

Q.767

satInd

*

*

*

*

contChkInd

*

*

*

*

echoCntrlDevInd

*

*

*

*

spare

F-H

F-H

F-H

F-H