Can anyone tell me why Argentina has two very different telephone connectors?

According to various sources (most concisely http://kropla.com/argentina.htm),
the telephone connectors used in Argentina come in one version that has
two flat blades, and a second that is similar to a phone connector.  I've
also seen a note that in some places the good ol' modular (aka, RJ-11)
connector is used.  So when someone buys a phone, FAX, or answering 
machine in Argentina, does it come with both (all 3?) styles or possibly
with adapters?

Speculation:  I'm aware that there are two major exchange carriers in
Argentina, Telecom Argentina in the North, and Telefonica de Argentina
in the South.  Is it possible that each of these companies uses a unique
preferred connector?

By the way, each of these phone companies has their own Web sites in
both English and Spanish.  If you are interested:

  Telecom Argentina is at        http://www.telecom.com.ar/
  Telefonica de Argentina is at  http://www.telefonica.com.ar/

And I've also looked at the web site for the Argentine equivalent of the 
FCC, Comision Nacional de Comunicaciones (CNC), but found nothing about
technical interconnection requirements (http://www.cnc.gov.ar).  (This
site is entirely in Spanish.)

Can anyone lend any insights to this situation?

  -- Scott R.

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 Scott Roleson, PE               |  Internet: [email protected]
 Telecom & EMC Engineer          |    http://www.WP.com/SRoleson
 San Diego AIO Division  MS 8-60 |  Telephone: +1-619-655-4809
 Hewlett-Packard Company         |  FAX:       +1-619-655-5931
 16399 W. Bernardo Drive         |  Amateur Radio:  KC7CJ
 San Diego, CA  92127-1899  USA  |  Any opinions are my own, not HP's.
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