Administration HiPath 3000/5000 V7 IP systems

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For internal use only HiPath 3000/5000 in the LAN Network
HG 1500 V3.0
4.5.5 Fax over IP with HG 1500 V3.0
Fax over IP guarantees the compatibility of traditional analog fax devices in IP telephony networks.
The following scenarios must be taken into account when using the real-time communication
system HiPath 3000 with the HG 1500 V3.0 board.
For Fax over IP the IP network must meet certain quality criteria that are determined in the network
analysis as otherwise interruptions can occur in the fax transmission. Otherwise the connection
and marketing of separate trunk lines should be provided for each node.
In general, an IP trunking network is when two or more HiPath 3000 systems are networked to
each other over the integrated HG 1500 V3.0 board. The HG 1500 V3.0 board supports two
functions for transferring the fax information.
● Fax over G.711 ("IP/IP e2e payload via enterprise proxy" connection)
The advantage of E.711 is that (unlike T.38) high speed faxes (in other words faxes with a
transmission rate > 14400 bps) can also use this higher transmission rate on a good network,
while high speed faxes must be slowed down to a speed of 14400 bps when T.38 is
used.
● T.38
T.38 is an ITU standard that describes how two fax machines communicate over IP. This
standard refers to a real-time transmission of fax documents because the formats for transmitting
the signalling and user data between two gateways are described here.
The image data (T.4 or T.6 format) and control messages (T.30 format) are packed in special
T.38 messages and sent via the IP network. The packets are either used with TCP
(Transmission Control Protocol) or UDP (User Datagram Protocol).
> At present HG 1500 V3.0 only permits transmission with UDP and not with TCP.
The advantage of T.38 is that it is more resistant to
packet loss and jitter in less than perfect network conditions. For more information, refer to
the service manual.
The functions were tested on the following devices:
– Siemens HF2323
– Siemens Fax 790
– Canon Fax B155,
– Hewlett-Packard OfficeJet Model 635,
– OKI OKIFAX 4580,
– OKI OKIFAX 4550,
P31003-H3570-Y100-4-7618, 2007-10-31
HiPath 3000/5000 V7, System Description 4-27