Comment 5 for bug 1038637

Fixed on main branch. See http://bazaar.launchpad.net/~didier-barvaux/rohc/main/revision/716 for details.

The first packets of a new stream must transmit the value of the RTP eXtension (X) bit. The field is considered as STATIC, so it should not change often but it must be transmitted at least on first packets. On those packets, the RX bit shall be set to 1 even if the TSS field (for TS_STRIDE) is set to 0. Upon field change, the compressor shall go back to FO state because the RTP eXtension bit is a STATIC field. It then can use either one IR, IR-DYN or UO-1-ID with extension 3, or any UOR-2* with extension 3.

Always transmitting the RTP eXtension (X) bit in the first packets of a stream makes change the reference captures of all the non-regression tests.