[LINK] VoIP configuration

David Lochrin dlochrin at key.net.au
Thu Oct 5 10:16:43 AEDT 2017


I recently bought a Cisco SPA112 analogue telephone adapter (ATA) in anticipation of migrating to the NBN.  It seems to be very good quality and flexible, certainly better than the average integrated modem & VoIP device, but it's intended to be deployed en-masse almost anywhere by telephony specialists.

So if an ordinary user wants to configure it for Australia, they have to research every detail, including a suitable dial plan, standard Oz tone & cadence definitions, ring cadence, even low-level electrical characteristics such as ring voltage and FXS port impedance.  (Have Link engineers ever seen an impedamce specified as "820+220||120nF"?  It actually describes an equivalent circuit.) 

However I've now found most of this stuff and can pass it on if anyone is interested.

David L.



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