Avaya IP Office 8.1 - Page 275

Product Description
IP Office 8.1
© 2012 AVAYA All rights reserved.
Page 275
Issue 26.k.- (16 August 2012)
IEEE 802.3 flow control is used on Avaya IP telephones operating in full-duplex mode. If the receiving device
becomes congested, it sends a pause frame to the transmitting device. The pause frame instructs the
transmitting device to stop sending packets for a specific period of time. The transmitting device waits the
requested time before sending more data.
VoIP Standards Supported
IP Office supports the following protocols and standards:
· H.323 V2 (1998), Packet-based multimedia communications systems.
· Q.931, ISDN user-network interface layer 3 specification for basic call control.
· H.225.0 (1998), Call signaling protocols and media stream packetization for packet-based multimedia
communication systems.
· H.245 (1998), Control protocol for multimedia communication.
· Session Initiation Protocol.
· Audio CODECs:
o
G.711 A-Law/Mu-Law (64K).
o
G.723.1 MP-MLQ (6.3K).
o
G.722.
· Silence Suppression.
· Fax Relay (IP Office to IP Office Fax Transport over IP).
· T.38 Fax support (SIP trunks and SIP endpoints).
· Local End Echo Cancellation 25ms.
· Out of band DTMF.
· Jitter buffer, 5 frames of jitter buffer.
· Internet Standards/Specification (in addition to TCP/UDP/IP).
o
RFC 1889 – RTP/RTCP, Real Time and Real Time Control Protocol.
o
RFC 2507, 2508, 2509 – Header Compression.
o
RFC 2474 – DiffServ, Type of Service field configurable.
o
RFC 1990 - PPP Fragmentation.
o
RFC 1490 - Encapsulation for Frame Relay.
o
RFC 2686 - Multiclass Extensions to Multilink PPP.
o
RFC 3261 - Session Initiation Protocol (SIP).
o
RFC 3489 - STUN.