IP telephony (VoIP) carries voice over the data network. A SIP Trunk is the link connecting your PBX (IPBX) to the phone network over IP, replacing legacy operated lines, with a quality of service to guarantee across the WAN.
It's the link between your phone system (IPBX) and the telephone network over IP: it replaces physical lines with voice channels over your connectivity, sized by number of simultaneous calls.
By prioritizing voice traffic (QoS) on the WAN — MPLS for end-to-end guarantee, SD-WAN for flexibility — and sizing the link. It's built into the network architecture.
It can be: redundant SIP Trunk, multiple accesses, automatic failover. Redundancy is designed to match how critical voice is to your business.
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