I am hoping someone can advise here on how an Internet Telephony Service Provider (ITSP) typically interfaces with the incumbent local exchange carrier (ILEC).
Are ITSPs typically required to buy physical PRI cirucuits from the ILEC and then resell the lines? Or do they connect via IP to an ILEC switch for access to they area code? Does an ITSP pay for circuits and DIDs or just DIDs?
any advice here is greatly appreciated.