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F.721�:�Videotelephony teleservice for ISDN �

Recommendation F.721

In force components
Number
 Title Status
F.721 (08/92)
� 		Videotelephony teleservice for ISDN � In force
�
�
Superseded and Withdrawn components
Number
 Title Status
F.721 (11/88)
� 		Basic narrow band videophone service in the ISDN � Superseded

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