sip means

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And it's scalable: Support for SIP means you can connect it to a call manager / PBX system for live and pre-recorded announcements and paging in an endless number of zones.
Y es escalable: La compatibilidad con SIP significa que puede conectarla a un gestor de llamadas/sistema PBX para anuncios en vivo y pregrabados y paginación en un número interminable de zonas.
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