Optional backward call indicators

Associated variants: All except ANSI 88

Contains information sent in the backward direction to notify the originating exchange of additional information about a call in progress.

typedef struct _optBckCalInd    /* Optional Backward Call Ind.          */
{
    ElmtHdr eh;                 /* element header                       */
    TknU8   inbndInfoInd;       /* in-band information indicator        */
    TknU8   caFwdMayOcc;        /* call forward may occur ind.          */
    TknU8   segInd;             /* simple segmentation indicator        */
    TknU8   netDelay;           /* network excessive delay indicator    */
    TknU8   usrNetIneractInd;   /* user-network interaction ind.        */
    TknU8   mlppUsrInd;         /* MLPP user indicator                  */
    TknU8   spare;              /* spare bits                           */
    TknU8   reserved;           /* reserved bits                        */
} SiOptBckCalInd;

The fields in the SiOptBckCalInd structure are encoded as follows:

Field

Value

inbndInfoInd

In-band information indicator. Defined values:

0x00 = INBND_NOIND   No indication

0x01 = INBND_AVAIL   In-band information or an appropriate pattern is now
available

caFwdMayOcc

Call forward may occur indicator. Defined values

0x00 = CAFWD_NOIND   No indication

0x01 = CAFWD_MAYOCC   Call diversion may occur

segInd

Simple segmentation indicator. Defined values:

0 = NOTSEGMENTED   No indication will be sent

1 = SEGMENTED   Additional information will be sent in a segmentation message

netDelay

Network excessive delay indicator. Defined values:

0 = No indication

1 = Delay encountered

usrNetIneractInd

User-network interaction indicator. Defined values:

0x00 = USERNET_NOIND   No indication

0x01 = USERNET_INTERACTOCCUR  User-network interaction occurs, cut through in both directions

mlppUsrInd

MLPP user indicator. Defined values:

0 = No indication

1 = MLPP user


Tokens for the ANSI, BICC, and ETSI variants

Token

ANSI 92

ANSI 95

BICC

ETSI V2

ETSI V3

inbndInfoInd

*

*

*

*

*

caFwdMayOcc

*

*

*

*

*

segInd

 

 

*

*

*

netDelay

 

*

 

 

 

usrNetIneractInd

*

*

 

 

 

mlppUsrInd

 

 

*

*

*

spare

C-D

C-E

 

 

 

reserved

E-G

E-F

E-H

E-H

E-H


Tokens for the ITU and Q.767 variants

Token

ITU Blue

ITU White

ITU 97

Q.767

inbndInfoInd

*

*

*

*

caFwdMayOcc

*

*

*

*

segInd

 

*

*

 

netDelay

 

 

 

 

usrNetIneractInd

 

 

 

 

mlppUsrInd

 

*

*

 

spare

C-D

 

 

C-D

reserved

E-H

E-H

E-H