caller ID and implementer's guide

Paul Long Plong at SMITHMICRO.COM
Thu May 13 18:25:34 EDT 1999


Chip,

Funny you should ask. In my first response to Glen, I said that we clear the
call, but just a few minutes ago I took another look at the code and found
that we completely ignore the calling party number IE in SETUP. Skip right
over the sucker. I must have been looking at how we handle the octet-3
extension bit for another IE, e.g., bearer capability (even Q.931 requires it
to always be 1).

While it turns out that we accept a call regardless of whether the extension
bit under discussion is set, I still stand by my assertion that an EP cannot
send a SETUP message to a v1 or v2 EP with the extension bit of octet 3 set to
0 and octet 3a present. I happen to know what my implementation does, and the
impact is minimal, but there are bound to be implementations out there
that--through no fault of their own--will in effect become "broken" if we
decide that this bit can be set to 0 and this octet can be present after all.

Paul Long
Smith Micro Software, Inc.

        -----Original Message-----
        From:   Chip Sharp [SMTP:chsharp at CISCO.COM]
        Sent:   Thursday, May 13, 1999 3:49 PM
        To:     ITU-SG16 at MAILBAG.INTEL.COM
        Subject:        Re: caller ID and implementer's guide

        What does your implementation do if it receives a "0" in the Extension
        field of Octet 3?

        Chip



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