Question #675471 on rohc changed:
https://answers.launchpad.net/rohc/+question/675471
Status: Open => Answered
Didier Barvaux proposed the following answer:
UO-1 packets are protected by a 3-bit CRC. UOR-2 packets are protected
by a 7-bit CRC. The 3-bit CRC is not considered enough to avoid residual
errors to remain undetected. Updating the decompressor context with one
UO-1 packet with a undetected residual error would cause error
propagation on the next packets.
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