RE: Simple Gateway Control Protocol -- short first comments

["Henry Sinnreich" <[e-mail]>]

The SGCP focuses on the PSTN-IP model and as such, can be quite useful if it
helps with standard mapping of both sides.
Considering however all the other IP telephony options, besides gateways,
making the gateway a component of Internet multimedia seems an attractive
choice. We may after all have IP telephony appliances using any other
Internet access such as xDSL, cable, etc.
A comprehensive model, with gateways as just another component is therefore
to be in mind.

Coming back to the gateway model: It would be useful to have a detailed
mapping to ISDN and SS7 signaling on the PSTN side and a similar mapping to
the IETF conforming side.

Scott has made some good comments to which I would like to add my 2 cents:

> SIP already drives me insane trying to remember what is a session, call,
> etc. I would be happy not to have some new terminology if the SIP
> terminology will do.
agree and would like to expand:

The SIP status code definitions and the SGCP overlap to a large degree. Why
not just re-use the SIP status codes, unless they need to be enhanced with
something that is missing ?

Some events listed:

fax tones
modem tones
continuity tones
are too much oriented towards voice-band tones and are hard to be
distinguished by untrained people.
Why not have SIP-like status codes, that can be displayed and also be
associated with a spoken message ?

Can SGCP use the same call ID as in SIP ?

Use URL's as in
http://www.ietf.org/internet-drafts/draft-antti-telephony-url-04.txt ?

The bottom line is, on the "IETF compliant" side, how much can SGCP be
integrated into the existing MMUSIC, PINT and IPTEL family of protocols and
re-use as much from there as possible ?

Life is enough complicated as is...

Thanks, Henry

Henry Sinnreich
MCI, 901 International Parkway
Richardson, Texas 75082
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