Grandstream UCM6300A/KZ

Reset button
Yes, long press to reset to factory settings and short press to reboot

VoP
LEC capabilities with NLP Packetized Voice Protocol, 128ms-tail-length Operator-class echo cancellation, Dynamic jitter buffer, modem detection and automatic switching to G.711, NetEQ, FEC 2.0, jitter resistance (up to 50% loss of audio packets)

Voice and fax. codecs
Opus, G.711 A-law/U-law, G.722, G722.1 G722.1C, G.723.1 5.3K/6.3K, G.726-32, G.729A/B, iLBC, GSM; T.38

Video codecs
H.264, H.263, H263+, H.265, VP8

QoS
Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS) QoS

API
API for integrating third-party platforms and applications

Operating system
Based on Asterisk 16 version

DTMF method
In-band audio, RFC4733 and SIP INFO

Automatic Configuration protocol and Plug-and-Play
Mass configuration using an XML configuration file with AES encryption, automatic detection and configuration of subscriber IP devices from Grandstream using ZeroConfig (DHCP Option 66 multicast SIP SUBSCRIBE mDNS), a list of events between the local and remote backbone

Network protocols
TCP/UDP/IP, RTP/RTCP, ICMP, ARP, DNS, DDNS, DHCP, NTP, TFTP, SSH, HTTP/HTTPS, PPPoE, STUN, SRTP, TLS, LDAP, HDLC, HDLC-ETH, PPP, Frame Relay (under development), IPv6,

Rebound methods
Busy/Overload/Howl Tone, Reverse polarity, Short-term shutdown, Circuit current shutdown

Data encryption
TLS, HTTPS, SSH, 802.1X