Re: [AVT] 2833bis - V.21

[Henning Schulzrinne <hgs@cs.columbia.edu>]

> - V.21 data bits:  It would be nice if we had a more efficient way of 
> sending
> V.21 data bits which also doesn't require us to use RFC 2198 
> redundancy. We
> could for example define two new events (one for each V.21 channel) 
> that simply
> use the (otherwise unused) volume field to encode the actual bit 
> values. That
> would enable us to send 20 ms of V.21 data bits in a single event.
> Alternatively, we could consider encoding it in the duration field as well
> (e.g. have volume indicate number of bits and duration the actual 
> bits), but
> that seems more inconsistent (it would on the other hand allow us to 
> encode up
> to the recommended 50 ms).
I'd rather not mess with the duration field, since that seems to 
possibly break things and requires more special-casing. I added the 
first option. Also, you need the duration to indicate which bits are 
actually valid. Otherwise, how would you express 0101, say?

[more to follow...]

Henning

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