ASN.1 question on supporting Redirecting Number in Annex G

Boaz Michaely boaz.michaely at ties.itu.ch
Tue Oct 24 15:39:33 EDT 2000


All,

Following up the work started at Lovely Portland, we are investigating the
required additions to the AccessRequest et. al. messages of H.225.0 Annex G.
I will post a seperate note on that, but along the way, an interesting question
poped:

The scenario: A VoIP network that is trying to terminate a call in PSTN, over
ISDN. The response from the CO indicates the call diversion and includes the
redirecting number element (which also indicates the diversion reason)
With H.225.0 v4 addition (TD-45 Osaka), this information can be naturaly
translated into H.225.0 setup message, while before that the only way to convey
the information was to translate it into H.450.3
Now, the network GK wishes to forward the call to the Service Zone for call
completion. In order to provide this information over AccessRequest, we may add
both H.450 element as well as RedirectingNumber element (for the questionable
sake of not mandating H.450 structures to do so).

Now to my question:
Assuming that indeed there is objection to mandate H.450 structure for this
purpose, how does one describe the RedirectingNumber IE within the ASN.1
structure of H.225.0 Annex G ?
After all, RedirectingNumber is imported from Q.931, and as such is bitwise
encoded. (there is probably a proper term for that which,  in my ignorance, I
am unaware off - sorry).
I have not seen any similar case, so the only solution I came up with is to
embed it in a BIT STRING. Is this realy how it should be done ? If so, what
would the exact syntax be ?

Thanks,

Boaz Michaely
Senior System Architect, Corporate
Comverse Network Systems
Tel: +972 (3) 766-3844 , Mobile +972 (51) 62-58-44
mailto:boaz.michaely at ties.itu.int
http://people.itu.int/~michaely

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