> Is there any generic schema,
No, each interface can dictates it's own use (or not) of field 127.
As Chhil indicates the structure of your field 127 drives the mechanism
of extracting any sub-components.
How is your field 127 structured? Does it have a bitmap, or does it
contain fixed length mandatory sub-components?
> if we don't have one specified by our network.
If you have field 127, then you should also have the definition of it's
content/structure. This definition must include details of any
sub-components and how their presence - if conditional - is indicated.
I guess there is something in your field 127 that you want to access?
If so, how did you know you needed or where it is to be located?
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Mark