Question on tone table definition in IETF SIG draft-8

Questions on sig mib draft-8 tone table representation.

1. According to NCS spec, "ROH Tone is generated by combining four tones
at frequencies of 1400 Hertz, 2060 Hertz, 2450 Hertz and 2600 Hertz at a
cadence of 0.1 second on, 0.1 second off, repeating."
But in the latest IETF signaling draft(ver 8),
pktcSigDevMultiFreqToneTable contains provision to store only two
frequency components.What would happen in the case that more than two
frequencies are required, like in the case of off-hook warning
notifications, where four frequencies are used??

2. Could it be possible to have an example of complex signals that were
used to define the requirements from this draft, in form of the MIB
elements (e.g. Japanese signal with the different element definitions or
complex repetition signals) for testing purposes?

3. pktcSigDevToneFrequencyNumber is the index to
pktcSigDevMultiFreqToneTable and its value ranges from 5-16. Why should
the index value start from 5??? 

Comments please...

Thanks,
Satish Kumar
Texas Instruments