VoIP firewall rules and priority markings
Overview
Real-time UDP cannot survive bulk download saturation—QoS and pinholes matter.
Checklist
SIP trunk provider IP list; RTP port ranges documented bidirectionally.
QoS
DSCP EF for voice classes on LAN; trust boundaries at routers.
ALG
SIP ALG off on modern SBC setups—vendor-specific guidance.
Troubleshooting
MOS scores; PCAP on mirror port short duration only with approval.
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