Summary

This Annex describes an extension of Recommendation H.223. It defines specific adaptation layers to allow the use of H.324 terminals in highly error-prone transmission environments. These adaptation layers include specific options for H.324 terminals, e.g:

•            error detection and correction;

•            sequence numbering;

•            automatic repeat request;

•            retransmission capabilities (hybrid ARQ-type I & II);

•            segmentation procedure to transmit frames which shall be transmitted unframed;

•            support of framed in unframed transmission mode.