RFC 4666, "Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA)", September 2006

Errata ID: 4475
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Valentin Micic
Date Reported: 2015-09-14
Held for Document Update by: Ben Campbell
Date Held: 2015-10-31

Section 3.6.1, Pg 53 says:

The optional SI [7,8] field contains one or more Service
      Indicators from the values described in the MTP3-User Identity
      field of the DUPU message.  The absence of the SI parameter in the
      Routing Key indicates the use of any SI value, excluding of course
      MTP management.  Where an SI parameter does not contain a multiple
      of four SIs, the parameter is padded out to 32-byte alignment.

It should say:

The optional SI [7,8] field contains one or more Service
      Indicators from the values described in the MTP3-User Identity
      field of the DUPU message.  The absence of the SI parameter in the
      Routing Key indicates the use of any SI value, excluding of course
      MTP management.  Where an SI parameter does not contain a multiple
      of four SIs, the parameter is padded out to 32-bit alignment.

Notes:

It seems obvious that diagram is referring to 32-bit and not 32-byte (as in 32-octets) alignment.

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