Session Initiation Protocol (SIP) uses VoIP protocol to connect phone systems to the PSTN. SIP trunk are seen as a cost-effective alternative or replacement for ISDN, which is being switched off in 2025.
Session Initiation Protocol (SIP) uses VoIP protocol to connect phone systems to the PSTN. SIP trunk are seen as a cost-effective alternative or replacement for ISDN, which is being switched off in 2025.
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