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Requirement of M2PA

+2 votes

In SIGTRAN we have M2UA and M2PA two protocols for the MTP2 level replacement but not sure which is used when. Any pointer?

posted Jul 29, 2013 by Sheetal Chauhan

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1 Answer

+1 vote

M2PA: Here the IPSP's MTP3 uses its underlying M2PA as a replacement for MTP2. Communication between the two layers MTP3/M2PA is defined by the same primitives as in SS7 MTP3/MTP2. M2PA performs functions similar to MTP2.

M2UA: The MTP2 User Adaptation Layer (M2UA) [M2UA] also adapts the MTP3 layer to the SCTP/IP stack. It does so through a backhauling architecture [RFC2719].

Following is the list of differences -

a. M2PA: IPSP processes MTP3/MTP2 primitives.
M2UA: MGC transports MTP3/MTP2 primitives between the SG's MTP2
and the MGC's MTP3 (via the NIF) for processing.

b. M2PA: SG-IPSP connection is an SS7 link.
M2UA: SG-MGC connection is not an SS7 link. It is an extension of MTP to a remote entity.

c. M2PA: SG is an SS7 node with a point code.
M2UA: SG is not an SS7 node and has no point code.

d. M2PA: SG can have upper SS7 layers, e.g., SCCP.
M2UA: SG does not have upper SS7 layers since it has no MTP3.

e. M2PA: relies on MTP3 for management procedures.
M2UA: uses M2UA management procedures.
answer Jul 29, 2013 by Salil Agrawal
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