Avaya IP Office 8.1 Product Description page 275

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.
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Q.931, ISDN user-network interface layer 3 specification for basic call control.
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H.225.0 (1998), Call signaling protocols and media stream packetization for packet-based multimedia
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communication systems.
H.245 (1998), Control protocol for multimedia communication.
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Session Initiation Protocol.
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Audio CODECs:
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G.711 A-Law/Mu-Law (64K).
o
G.723.1 MP-MLQ (6.3K).
o
G.722.
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Silence Suppression.
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Fax Relay (IP Office to IP Office Fax Transport over IP).
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T.38 Fax support (SIP trunks and SIP endpoints).
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Local End Echo Cancellation 25ms.
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Out of band DTMF.
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Jitter buffer, 5 frames of jitter buffer.
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Internet Standards/Specification (in addition to TCP/UDP/IP).
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RFC 1889 – RTP/RTCP, Real Time and Real Time Control Protocol.
o
RFC 2507, 2508, 2509 – Header Compression.
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RFC 2474 – DiffServ, Type of Service field configurable.
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RFC 1990 - PPP Fragmentation.
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RFC 1490 - Encapsulation for Frame Relay.
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RFC 2686 - Multiclass Extensions to Multilink PPP.
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RFC 3261 - Session Initiation Protocol (SIP).
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RFC 3489 - STUN.
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Product Description
IP Office 8.1
© 2012 AVAYA All rights reserved.
Page 275
Issue 26.k.- (16 August 2012)