The Grandstream HT813 is a combination analog telephone adapter offering 1 FXS port for an analog phone and 1 FXO port for connecting to the PSTN line.
It's ideal for keeping a PSTN line available for backup or fax use alongside a VoIP extension.
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| Ports | 1 FXS + 1 FXO |
| Network Interface | 1 x Fast Ethernet / Gigabit (model dependent) |
| Voice Codecs | Opus, G.711, G.722, G.723.1, G.726, G.729A/B, iLBC |
| Fax Support | T.38 Fax-over-IP |
| Security | TLS, SRTP |
| Provisioning | Automated via HTTP/TFTP with XML config files |
| Built-In Redundancy: PSTN failover keeps calls working during an outage |
| Flexible Deployment: Combine an analog phone with a live PSTN backup line |
| Easy Setup: Zero-touch provisioning for fast deployment |
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