Separation of DATA and VoIP equipment Best Practices VoIP-SIP Security

The IP separation consists of attributing different addressing domains to the data network and the VoIP network, for example 192.168.1.x addresses for data network elements (the various servers and user PCs) and 192.168.2.x for the VoIP elements (with a subnet mask). Once the separation is in place, it’s possible to set ACLs (Access Control List) on the Layer 3 equipments (L3 switches, routers and firewalls) to authorize communication only between authorised IP addresses.
If the VoIP network needs services such as DNS, DHCH or NTP, is it recommended
that it possess its own servers.
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