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RFC 5087, "Time Division Multiplexing over IP (TDMoIP)", December 2007

Source of RFC: pwe3 (int)

Errata ID: 1221
Status: Rejected
Type: Technical
Publication Format(s) : TEXT

Reported By: Alfred Hoenes
Date Reported: 2008-01-03
Rejected by: Stewart Bryant
Date Rejected: 2011-08-04

Section App. A says:

      if D > 0 then
        { packets expected, expected+1, ... received-1 are lost }
         while not over-run
           place filler (all-ones or interpolation) into playout buffer
           if not over-run then
             place packet contents into playout buffer
           else
             discard packet contents
           set expected = (received + 1) mod 2^16
       else  { late packet arrived }
         [...]

It should say:

       if D > 0 then
         { packets expected, expected+1, ... received-1 are lost }
         while not over-run  and  D > 0
           place filler (all-ones or interpolation) into playout buffer
           set D = D - 1
         if not over-run then
           place packet contents into playout buffer
         else
           discard packet contents
         set expected = (received + 1) mod 2^16
       else  { late packet arrived }
         [...]

Notes:

The pseudocode on mid-page 31 is severely flawed.
The counter value 'D' is never decremented and hence almost useless.
The code will erroneously loop until over-run.
Also, the final treatment must be taken out of the loop,
which needs to be indicated by reducing the indentation of 5 lines
by two character positions.
--VERIFIER NOTES--
D is a local temporary variable that is recalculated whenever a new packet is received and the condition (received = expected) is false. The scope of D is the else condition in which it is calculated.

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