====== Central PSTN gateway ====== Global directory searching (eg, using [[SDS]]) could return results that resolve to [[http://en.wikipedia.org/wiki/Session_Initiation_Protocol|SIP]] gateways (Asterisk servers) that can terminate your call on the [[http://en.wikipedia.org/wiki/Public_switched_telephone_network|PSTN]]. These SIP servers could be listed with http://www.sipbroker.com for incoming calls.


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