The Grandstream HT881 is an analog FXO gateway that connects multiple PSTN lines into a VoIP network, commonly used to bridge legacy phone lines into a SIP PBX.
It's suited to small and medium businesses that want to keep existing PSTN lines usable inside a modern VoIP system.
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| Port Type | FXO (PSTN line connections) |
| Network Interface | Gigabit Ethernet |
| 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 |
| Keep Your PSTN Lines: Bring existing analog lines into a modern VoIP/PBX setup |
| Simple PBX Integration: Plays well with UCM and other SIP-based PBX platforms |
| Cost-Effective Bridging: An affordable way to connect legacy lines to VoIP |
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