Discrete/hybrid DAA vs "integrated"

DAA ? What are you talking about ? Is this the old plain telephone interface for MoDem ?

Hab.

A line interface to the PSTN

Ok. Try a all-in-one Silvertel modules. There are relatively cheap and work very well.

It depends on what you want to do. the Ag1171 is a SLIC (FXS), it can give the ringing voltage (+48V , 85V trapezoidal 25Hz). The FXO is the Ag2130.

I use them for a customer (1500 auto-attendant systems were delivered in

2012/2013 without any problems). The arch was very simple (STM32 micro, WM8731 Codec, SLIC and COIC from Silvertel, a uSD card, and .... software)

No comment. Try to google with "ringing slic" ... ther are plenty Silvertel alternatives from China.

Hab.

I'm interested in the functionality of the 2130. But, *it* looks to be a discrete/hybrid approach so perhaps an endorsement of that? It just happens to be prepackaged in a SIL module -- perhaps carrying agency certifications, as well? (I've not read the DS yet)

I am mostly concerned about availability in small quantities (left-pondian) and whether or not any parts of it are covered under NDA's -- which would make an "open" design problematic. I'm not interested in buying and reselling parts to hobbyists because a device is only available in big lots, etc.

I'll have a look at the specifics as well as availability, here. Thanks!

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Silvertel SIL modules are not covered by NDA, AFAIK. You could purchase som e of at

Habib.