In order to make you compatible with the new protocols using VOIP, ESI has developed the AD1 module. This enables you to convert the received VOIP streams to F1 and transfer them to your XOIPs while maintaining the same listening and intercom management capabilities than the ones currently granted by (as you currently have on) your PABXs. In this context, no need to acquire a new VOIP-type PBX infrastructure.
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