RFC4815 no TS bits

Dear ROHCer,

     In the RFC4815 4.2 "When no TS bits are received in the  
compressed header, the scaled TS value is reconstructed assuming a  
linear extrapolation from the SN, i.e., delta_TS = delta_SN *  
default-slope, where delta_SN and delta_TS are both signed integers."

     Does that mean the decompressor must receive at least one scaled  
TS before get no-TS bits? How about absolute TS or unscaled TS? Since  
the decompressor can derive the scaled TS directly when it gets the  
unscaled TS, the compressor can send several unscaled TS to establish  
the TS_STRIDE and the relationship of delta_TS. Is that right?

Sincerely,
Jer-ming

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