OSI/MHS Configuration and Management Manual

OSI Address Configuration in OSI/MHS
OSI/MHS Configuration and Management Manual—424827-003
D-19
Different Incoming Calling Address and Outgoing
Called Address
The most likely way in which these addresses differ is in the NSAP component; that is,
<in-s-nsap> differs from <out-d-nsap>. There is a simple way to achieve this effect
when using 1980 X.25.
The addresses can be configured by setting the REM-NSAP- parameter on the ADD
MTA command to <in-s-nsap>, and setting the X25DESTADDR parameter, on the ADD
PROFILE command, to <out-d-nsap>. The former step ensures that the validation
performed by OSI/MHS will be successful, and the latter ensures that outgoing calls
are made to the correct address.
For example, if the ADD PROFILE command in “Adjacent MTA Address Configuration”
were changed as shown below and all other commands remained the same, then the
resulting addresses would be as follows:
== Changing the outgoing called address
ADD PROFILE $zosi.#L3.Carl1, &
X25DESTADDR "311042100091288" , X25PORT 01
== Different incoming calling and outgoing called addresses
OUT(D): t-selector = 4D4853415431
X.25 NUA = 311042100091288
IN(S): t-selector = 4D4853415431
X.25 NUA = 311042100091206
This method works well when the NSAPs differ and the same upper layer addresses
are being used. If the upper layer addresses, such as the Transport selectors, differ,
then a different approach has to be used. In this case, the only solution is to configure
both <out-d-tsel> and <in-s-tsel> as REM-TSELECTOR- parameters on the ADD MTA
command. Here is an example:
== Configuring different values for <out-d-tsel> and
== <in-s-tsel>
ADD MTA $zmhs.#Carl, &
:
rem-tselector-1 4D4853415431,&
rem-tselector-2 4D4853415432,&
:
A potentially undesirable side effect of this method is that, in failure situations,
OSI/MHS tries both of these addresses as if they were <out-d-tsel> addresses. If this
effect causes problems, then another approach is to configure multiple MTA objects to
define the different addresses. The REM-LOCAL-INIT and REM-REMOTE-INIT
parameters can be used to control the use of the configured addresses as <out-d-tsel>
or <in-s-tsel>.
Note. The X.25 NUA of OUT(D) assumes the value X25DESTADDR. The X.25 NUA of IN(S)
is the string equivalent of the NSAP specified in the ADD MTA command.