Re: DCS and PID handling in Kannel

Citando David White <[email protected]>:

> On Tue, 2003-02-18 at 07:06, Bruno Rodrigues wrote:
> 
> > DCS is used internally in kannel and thus should be "controled" by it.
> > That's why we have seperated fields to build DCS at the end. 
> > For example, if you set UDH and don't set coding, kannel will
> > automatically (legacy behaviour) select 8 bit text and adapt your text
> > data to it.
> 
> Which is severely broken. Consider EMS messages, which have (e.g.) a
> bitmap in the header and 7-bit text in the remaining space in the user
> data field. Interpretation of user data is solely a function of DCS,
> that's why it's there.

It was broken, that's why it's called legacy, but you can force coding=1 and
send your 7 bit ems.


> > Using coding, mclass, mwi and alt-dcs, every dcs combination can be
> > done, if smsc modules supports it of course. EMI2 and AT2 surelly
> > supports it.
> > 
> > I can make a table in userguide with it's combinations to describe it.
> > 
> 
> You will discover that the coding scheme cannot be completely
> reconstructed from the data Kannel sends. DCS 0xF5 should be equivalent
> to DCS 0x15, but there's no guarantee a mobile phone (or some
> third-party app for a smartphone) will be so smart as to recognize the
> equivalence.

GET 'http://.../sendsms?...&text=123&coding=2&mclass=2'
2003-02-18 10:41:36 Sent SMS ... [flags:2:2:0:0:0] [msg:3:313233] [udh:0:]
2003-02-18 10:41:35 [15] DEBUG: EMI2[Vodafone-P31579]: emi2 sending packet:
<92/.../020115///81> = DCS = 0x15

GET 'http://.../sendsms?...&text=123&coding=2&mclass=2&alt-dcs=1'
2003-02-18 10:41:41 Sent SMS ... [flags:2:2:0:0:0] [msg:3:313233] [udh:0:]
2003-02-18 10:41:41 [15] DEBUG: EMI2[Vodafone-P31579]: emi2 sending packet:
<93/.../0201F5///97>

Trust me. You can make a 1 to 1 conversion between DCS and (mc,co,mwi,alt). I've
done that code, and I've tested it several times.


> I made these suggestions and sent an SMPP patch because I encountered
> problems trying to get Kannel to handle MO messages correctly. One of
> these problems is that it screws up DCS.

Can you send me your message or a url to an archive ? I usually don't pay
attention to other smsc modules as I don't use them.



-- 
Davi / Bruno.Rodrigues<at>Litux.Org
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