Best Dss Wireless Doorbells

Panel adopts advanced wiredrawing aluminum alloy material, high strength damage resistant button, strong and durable, built-in speakers and high sensitive microphone, support hands-free calls and receive emergency broadcast, one key to dial emergency call for help, realize the bi-directional full-duplex voice intercom, with poe phone features: web support multi-language 1 sip account, hotline call hold, call waiting, call forward call transfer (blind/busy/ask) mute, auto-answer, 3-way conferencing 1 ds programmable key(speed dial, intercom etc.) Volume control direct ip call without sip proxy default ring tone 1 selection/import/delete custom warning ring tone 2 selection/import/delete time setting(server/manual) support sip main/standby server advanced features: 1 key to restore the factory value 1 DSS ogrammable key(speed dial, intercom etc.) 2 input and 2 output control interface, can connect other security equipment 1 recording interface, 1 custom warning ring tone interface(using ring tone 2) ip PBX system integration: busy lamp field (BLF), BLF list bridged line appearance (bla) DND & forward synchronization intercom, paging, music on hold call pickup, dial plan, call recording anonymous call, anonymous call rejection codes and voice features: wideband codec: g.722 narrowband codec: g.711/a, g.723.1 g.726, g.729a/b, digest authentication using md5/md5-sess.