CS1K /MPLR33004 *** a limited defective patch***

[smaiyaur]

Patch MPLR33004 is a GEN patch designed to prevent MCDN FACILITY message loopback. The Sig Server portion of the fix is done as a VTRK SU.
The patch is included in CS1000 7.5 SP24 and CS1000 7.6 SP4.
The patch adds OPTIONS IE to the FACILITY message in order to provide a message “hop” counter.
A pre-existing problem in the CS1000 6.0 and 7.0 Sig Server will result in failure to properly handle the FACILITY message with OPTIONS IE header. Such FACILITY message will be ignored.
Therefore all MCDN related features that use FACILITY message (MWI, RCFW, NRAG for example) will not work properly.

CS1000 7.5 and 7.6 sw without MPLR33004 and associated VTRK SU will also experience the same problem when OPTIONS IE is received.

Be aware that the original FACILITY looping problem has only been seen on a small number of sites in the field, and only when SM is used as a SIP proxy server.
Only SM running releases older than 6.2 SP2 are affected.

The recommendation is to put patch MPLR33004 out of service (the associated SU can remain inservice), if 1. FACILITY loopback issue is not experienced; or 2. SM is not used as SIP proxy server; or 3. SM is used but with a software release newer than 6.2 SP2.
If MPLR33004 must be in service, then the recommendation is that other CS1000 systems are upgraded to CS1000 7.6 SP4 or higher.

[smaiyaur]

MPLR33004 is a GEN patch designed to prevent MCDN FACILITY message loopback. The Sig Server portion of the fix is done as a VTRK SU. The patch is included in CS1000 7.5 SP24 and CS1000 7.6 SP4. The patch adds OPTIONS IE to the FACILITY message in order to provide a message “hop” counter.

A pre-existing problem in the CS1000 6.0 and 7.0 Sig Server will result in failure to properly handle the FACILITY message with OPTIONS IE header. Such FACILITY message will be ignored. Therefore all MCDN related features that use FACILITY message (MWI, RCFW, NRAG for example) will not work properly. CS1000 7.5 and 7.6 sw without MPLR33004 and associated VTRK SU will also experience the same problem when OPTIONS IE is received.

Be aware that the original FACILITY looping problem has only been seen on a small number of sites in the field, and only when SM is used as a SIP proxy server. Only SM running releases older than 6.2 SP2 are affected.

The recommendation is to put patch MPLR33004 out of service (the associated SU can remain inservice), if 1. FACILITY loopback issue is not experienced; or 2. SM is not used as SIP proxy server; or 3. SM is used but with a software release newer than 6.2 SP2.

If MPLR33004 must be in service, then the recommendation is that other CS1000 systems are upgraded to CS1000 7.5 SP24 / 7.6 SP4 or higher.

[smaiyaur]

- MPLR33004
o PCNs for each of R7.5 SP24 and R7.6 SP4 were updated last week, to include more detailed Special Instructions for this patch.
o The Release Notes for each of R7.5 SP24 and R7.6 SP4 were also updated accordingly.