| In force components |
Number
|
Title |
Status |
Q.931 (05/98)
� |
ISDN user-network interface layer 3 specification for basic call control
�
|
In force
|
Q.931 (1998) Erratum 1 (02/03)
� |
�
|
In force
|
Q.931/I.451 (1998) Amendment 2 (12/23)
� |
Extensions for the support for the calling line identification authentication
�
|
In force
|
Q.931 (1998) Amendment 1 (12/02)
� |
Extensions for the support of digital multiplexing equipment
�
|
In force
|
�
� |
| Superseded and Withdrawn components |
Number
|
Title |
Status |
Q.931/I.451 (11/88)
� |
ISDN user-network interface layer 3 specification for basic call control
�
This Recommendation is also included but not published in I series under alias number I.451
|
Superseded
|
Q.931 (03/93)
� |
ISDN user-network interface layer 3 specification for basic call control
�
This Recommendation is also included but not published in I series under alias number I.451
|
Superseded
|
