[BLISS] Initial ringtones for draft-alexeitsev-bliss-alert-info-urns

[Adam Roach <adam at nostrum.com>]

There are a number of additional tones that are probably worth
considering as part of the initial set of symbols. If you look at
TIA/EIA-41-D and 3GPP2 A.S0014, you'll find quite a few tone
designations that are used in other standards.

A.S0014 defines:

  1. Normal Alerting
  2. Inter-group Alerting
  3. Special/Priority Alerting
  4. Ping Ring (abbreviated alert)
  5. Abbreviated intercept
  6. Abbreviated reorder

I think #1 and #4 are covered in the current document, but the others
aren't clearly represented.

If you throw in the TIA/EIA values, you also have things like:

  1. Long (Normal)
  2. Short-Short
  3. Short-Short-Long
  4. Short-Short2
  5. Short-Long-Short
  6. Short-Short-Short-Short
  7. PBX Long (Normal)
  8. PBX Short-Short
  9. PBX Short-Short-Long
 10. PBX Short-Long-Short
 11. PBX Short-Short-Short-Short


Additionally, A.S0014 allows indication of pitch (high, normal, low) as
part of the ringtone designation. It would be nice if we could tack this
pitch data on to the end of the existing tokens (e.g.,
"normal.short.low"). I note that this points to a combinatorial
explosion of IANA values -- perhaps we need to re-think how we're
representing the registry.

/a