Afhjúpaður tveggja lykil trefjastyrktur plastsími

Telephone system: DTMF
Hringingarmerki fyrir innhringingu;
Ring pressure: ≥ 70dB(A);
Call connection time≤6S (non-blocking);
The maximum communication distance is 5km;
Classified rated sound pressure level intensity: ≥90dBA;
Hljóðsvið: 300Hz ~ 3400Hz;
Harmónísk röskun: ≤ 5%;
DTMF kallakerfi;
Málspenna: DC48V/DC24V;
Sending/receiving frequency response: in line with GB/T15279-2002;
Sendingarstyrkur (SLR): 5 ~ 15dB;
Móttekið hljóðstyrkseinkunn (RLR): -7 ~ 2dB;
Sidetone Masking Rating (STMR): ≥7dB;
The system has strong expansion compatibility and supports standard SIP 2.0 (RFC3261) and related RFC protocols;
Stuðningur: TCP/UDP, HTTP, ARP/RARP, DNS, NTP, TFTP, TELNET;
Multiple voice coding methods such as G.729, G.723, G.711, G.722, G.726 are optional;
DTMF mode RFC2833, SIP INFO, INBAND;
Styðja kyrrstæða breytingu á IP tölu, upplausn DNS léns;
Support one-key direct call dispatcher function and SOS emergency call;
Provide alarm, monitoring, intercom, broadcast functions;
Full duplex kallkerfi virka;
Samþykkja háþróaða bergmálshættutækni;
Speaker sensitivity can be adjusted;
Kerfið veitir upptöku og upptökuúttak og getur hringt í og spurt upptökuskrár hvenær sem er;
Can be set through WEB interface;
Online software update