----- Original Message ----- > From: "Сергей Харламов" <men...@bk.ru>
> Can someone explain me how can I get an block of DID (Telephony > numbers)? For example I need 200 numbers. Is that special organization > or I must buy it somewhere? > What the rule for USA (NY) about telephony providing ? Should I have a > licence to sale ip telephony? DID numbers are actually E.164 addresses, which are relevant in the context of the IPSTN. Because they are addresses on a specific network, in order to have some assigned to you, you need to have a connection to that network. Generally, that connection is either via SIP+RTP over IP to a VoIP gateway provider, who in turn connects to the PSTN using PRI trunks to their supplier's switch, or who is themselves the operator of a switch which is connected to the PSTN by SS7... or you yourself do one of those two things, in (very) roughly increasing order of cost. We'll assume for the moment, that you do not want to become a CLEC. (The rest of this message is even more USAdian than the first part.) To get DID numbers in a given area, you need to purchase connectivity service from a telco or gateway provider with physical facilities in that area. On the VoIP side, it's common for the "DID" to be the actual thing you purchase, and the transport and minutes (if any) come along with it. If you're buying a local PRI circuit to a local RBOC/CLEC, then "blocks" of DID's are something you buy at extra cost, and you tell the telco how to group the channels on your PRIs, and which DIDs to route to which trunkgroups. In both cases, outbound-only service is possible to buy, so the DID(s) are actually optional. In short, though, if you have physical gear in the US somewhere, you can buy a PRI and put DIDs on it; if you don't, you can contract with one or more VoIP providers who do, and backhaul the traffic that way. If you ever decide you have to switch the DIDs to a different carrier, you will find that this is easier and harder depending on whom you're working with; I don't think there's a rule. Did that help? Cheers, -- jra -- Jay R. Ashworth Baylink j...@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274
