Every customer will have different expectations and different budgets to work to. Some will be willing to upgrade their networks to use the best possible equipment and practices. To others the additional expense may be viewed as unnecessary. Examples of standards based Quality of Service protocols include:
802.1Q (Layer 2)
DiffServ (Layer 3)
Port Range (Layer 4)
802.1X (MD-5)
Voice compression codecs
The bandwidth used varies depending on the compression method chosen. IP Office supports standards listed below. These will occupy approximately 10K and 13K of bandwidth respectively. Use the following chart to choose the most appropriate compression algorithm for your available bandwidth.
Audio Codec
RTP Voice Data Payload (bytes)
Packets per second
LAN (bps)
% overhead LAN
WAN (bps)
% overhead WAN
Algorithmic delay (ms)
G.723.1 (6.3K)
24
33.33
20,800
225%
9,867
54%
80
G.729a
20
50
29,600
270%
13,200
65%
40
G.711 (64K)
160
50
85,600
34%
69,200
8%
20
G.722 (64K)
160
50
85,600
34%
69,200
8%
20
VoIP standards
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.
SIP
Session Initiation Protocol
T.38
Fax standard
Internet standards
(In addition to TCP/UDP/IP.)
Standard
Description
RFC 1889
Real Time Protocol (RTP) and Real Time Control Protocol (RTCP)
RFC 2507, 2508, 2509
Header compression
RFC 2474
DiffServ, Type of Service field configurable
RFC 1990
PPP fragmentation
RFC 1490
Encapsulation for Frame Relay
RFC 2686
Multiclass Extensions to Multilink PPP
RFC 3261
SIP
RFC 3489
STUN
Analog trunk standards
IP Office analog trunk cards conform to the standards:
TIA/EIA-646-B
Loop Start
GR-188-CORE and GR-31-CORE
Incoming Caller line identification (ICLID)
ANSI T1.401 and TIA/EIA-646-B
Ground Start (not available in all localities)
Database interface standards
IP Office supports the ActiveX Data Object (ADO) interface standard.
PCI Security Standard Council standards
Leading credit card companies defined standards in the PCI Security Standard Council and one of these standards is not recording credit card numbers given by the customer.
