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Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows

Overview This paper contains best current practice examples of Session Initiation Protocol (SIP) call flows showing interworking with the Public Switched Telephone Network (PSTN). Elements in these call flows include SIP User Agents, SIP Proxy Servers, and PSTN Gateways. Scenarios include SIP to PSTN, PSTN to SIP, and PSTN to PSTN via SIP. PSTN telephony protocols are illustrated using ISDN (Integrated Services Digital Network), ISUP (ISDN User Part), and FGB (Feature Group B) circuit associated signaling. PSTN calls are illustrated using global telephone numbers from the PSTN and private extensions served on by a PBX (Private Branch Exchange).

Further White Paper Details
Publisher	Internet Society	File Format	HTML
Date Published	December 2003	Downloads	1262
Format	White Papers
Topics	Industry Standard Protocols, Proxy Servers, Telephony Systems - PBX

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