about modify M2ua Adapted to M2PA

for the integrity of a protocol,"m2pa(RFC4165)" also is written as Atm
Signalling link in rfc3331:

RFC 3331:

1.4.1  Support for MTP Level 2 / MTP Level 3 interface boundary

   M2UA supports a MTP Level 2 / MTP Level 3 interface boundary that
   enables a seamless, or as seamless as possible, operation of the
   MTP2-User peers in the SS7 and IP domains.  An example of the
   primitives that need to be supported can be found in [10].
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   [10] ITU-T Recommendation Q.2140, 'B-ISDN ATM Adaptation Layer',
        February 1995