XCON: Can't Communicate w/ MTA via French X.25 Network (157902)
The information in this article applies to:
- Microsoft Exchange Server 4.0
This article was previously published under Q157902 SYMPTOMS
If Microsoft Exchange is configured to use a sub address, it cannot
communicate with another Microsoft Exchange MTA or any other MTA through
the French X.25 network (Transpac). When Exchange accepts an X.25 call, it
sends back a Call Accept packet with its own X.121 address.
CAUSE
The CCITT X.25 1988 recommendations state that there are two formats for
this packet: Basic and Extended. If the Extended format is used, an Address
block is optional and Microsoft Exchange operates successfully. However,
the French X.25 network uses the basic format. The problem occurs because
the French X.25 network automatically adds the local DTE address. The only
time that this problem occurs is when you use a sub address.
Microsoft Exchange fails to communicate over X.25 in France. The Extended
format is only used if a specific complementary service is required. The
Address block is only used if Call Forwarding is active. Because this
service is not requested and the Address block is non-zero, the X.25
network clears the communication with an error code of 4A, which translates
into Longer of Address non zero.
STATUS
Microsoft has confirmed this to be a problem in Exchange Server version
4.0.
A supported fix is now available, but has not been fully regression-tested
and should be applied only to systems experiencing this specific problem.
Unless you are severely impacted by this specific problem, Microsoft
recommends that you wait for the next Service Pack that contains this fix.
Contact Microsoft Product Support Services for more information.
MORE INFORMATION
The following components have been modified to handle special case for non-
standard French X.25 network.
EMSMTA.EXE
MTACHECK.EXE
MMIEXT.DLL
SAALOG.DLL\**
| Modification Type: | Minor | Last Reviewed: | 4/28/2005 |
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| Keywords: | kbother KB157902 |
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