User's Manual Part 2

Chapter 14 Product Specifications
BM2022w User’s Guide
211
SIP ALG Your device is a SIP Application Layer Gateway (ALG). It allows VoIP calls to
pass through NAT for devices behind it (such as a SIP-based VoIP software
application on a computer).
Dynamic Jitter Buffer The built-in adaptive buffer helps to smooth out the variations in delay (jitter)
for voice traffic (up to 60 ms). This helps ensure good voice quality for your
conversations.
Voice Activity Detection/
Silence Suppression
Voice Activity Detection (VAD) reduces the bandwidth that a call uses by not
transmitting when you are not speaking.
Comfort Noise Generation Your device generates background noise to fill moments of silence when the
other device in a call stops transmitting because the other party is not
speaking (as total silence could easily be mistaken for a lost connection).
Echo Cancellation You device supports G.168 of at least 24 ms.
This an ITU-T standard for eliminating the echo caused by the sound of your
voice reverberating in the telephone receiver while you talk.
Time and Date Get the current time and date from an external server when you turn on your
BM2022w. You can also set the time manually.
Logging Use the BM2022w’s logging feature to view connection history, surveillance
logs, and error messages.
Codecs G.711 (PCM
ì-law and a-law), G729, G.729a
Fax Support T.38 FAX relay (FAX over UDP).
G.711 fax relay for fax calls and be able to renegotiate codec to G.711 if a fax
call is detected.
Ring Tones Supports different distinctive ring tones on each line.
Call Prioritization Prioritize VoIP traffic originating from the RJ-11 ports over any other traffic.
Table 107 Standards Supported
STANDARD DESCRIPTION
RFC 768 User Datagram Protocol
RFC 791 Internet Protocol v4
RFC 792 Internet Control Message Protocol
RFC 792 Transmission Control Protocol
RFC 826 Address Resolution Protocol
RFC 854 Telnet Protocol
RFC 1112 IGMPv2
RFC 1349 Type of Service Protocol
RFC 1706 DNS NSAP Resource Records
RFC 1889 Real-time Transport Protocol (RTP)
RFC 1890 Real-time Transport Control Protocol (RTCP)
RFC 2030 Simple Network Time Protocol
RFC 2104 HMAC: Keyed-Hashing for Message Authentication
RFC 2236 IGMPv2
RFC 2131 Dynamic Host Configuration Protocol
RFC 2401 Security Architecture for the Internet Protocol
RFC 2409 Internet Key Exchange
RFC 2475 Architecture for Differentiated Services (Diffserv)
Table 106 Firmware Specifications (continued)
FEATURE DESCRIPTION