given the complete impracticability ( in my view ) of implementing a wholly voip network at a scale of about 10k-20K users at 200+ sites – does anyone have any knowledge experience or suggestions how Voip could be interworked to legacy networks without loss of functionality.
It is possible to connect an E1/T1 tie route eg DPNSS to a router and have the data network tunnel the link. If your not concerned with feature transparency across the legacy PABX network the options are even better. Use the VoIP facilities of the data network to act as a distributed transit/tandem voice switch. Use the PABX to insert site codes into the number sent to the Voip and the Voip network then switches to the desired site. In this way you dont need seperate routes between PABX’s AND you dont end up doing multiple voip conversions.
I’ve done it in a large network of dissimilar switches (not 200 sites but exactly same troubles and principles) with high success rate.
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send you my contact details if you want to discuss it more.