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| Port # | Protocol | Purpose |
|---|---|---|
| 123 | UDP | Used for NTP to sync device time |
| 5060 | UDP | Used for SIP to initiate calls |
| 10,000-20,000+ | UDP | Used for RTP for voice data receipt and transmission |
| 80 | TCP | Used for device firmware |
| 443 | TCP | Used for secure handset remote configuration |
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