Re: Query on how to instantiate a call for “Request to call”.

Rohith,

Indeed, the SCP is the primary example of the "Executive System." Another=
 such
example is the IN Service Node (SN) described in ITU-T Recommendation Q.1=
205. In
the case of the SN, both parts of the call are created using ISDN PRI and
bridged by the SN.=20

As far as the PSTN is concerned, only IN was envisioned by PINT. (In othe=
r
words, no messages were expected to be sent directly to switches.) Nevert=
heless,
nothing precludes implementing PINT on a switch if an operator wishes to =
do so.
In this case, the call will, of course, be created by the switch iself.=20

To this end, PINT assumed that the enterprise (PBX) PINT implementations =
do use
the switch as an "Executive System."

With best regards,

Igor Faynberg=20

rohith wrote:
>=20
> Hi All,
>=20
> I was going through the RFCs 2848 and 2458.  I wanted to know if there =
are any standard defined for and beyond the =93Executive System=94 (RFC 2=
848, figure 1).  In particular I wanted to know the protocols and message=
s that are used in the PSTN to bring about the =93Request to call=94.
>=20
> The SCP initiated =93Create call=94 message could be used for instantia=
ting a call in an IN environment.  Are there any such non-IN solutions do=
 to this (besides using =93RLT=94 or =93a service node that call-transfer=
s=94)?
>=20
> Thanks,
> Rohith K N
>=20
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