ZyXEL Communications MAX318M2W, User Manual

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Chapter 10 The VoIP Account Screens
MAX318M2W User’s Guide
153
The following table describes the labels in this screen.
10.9 Technical Reference
The following section contains additional technical information about the WiMAX
Device features described in this chapter.
10.9.1 SIP Call Progression
The following figure displays the basic steps in the setup and tear down of a SIP
call. A calls B.
Table 57 VoIP > Account 1 (or Account 2) > FAX
LABEL DESCRIPTION
Options Select which standard the WiMAX Device uses to handle faxes. The peer
devices must also use standard.
NONE - Disable the fax function.
G.711A Pass Through - Select this option to send and receive fax messages
over the network or Internet using VoIP (G.711a). By encoding fax data as
audio data, faxes may be susceptible to packet loss and other errors.
However, as this standard is considerably older than T.38, it is more
compatible with older orobsolete systems. Select this if you want the WiMAX
Device to work with European PCM (Pulse Code Modulation) systems.
G.711U Pass Through - Select this option to send and receive fax messages
over the network or Internet using VoIP (G.711u). By encoding fax data as
audio data, faxes may be susceptible to packet loss and other errors.
However, as this standard is considerably older than T.38, it is more
compatible with older orobsolete systems. Select this if you want the WiMAX
Device to work with American PCM systems.
T.38 FAX Relay - Select this if the WiMAX Device should send fax messages
as UDP or TCP/IP packets through IP networks. This provides better quality,
but it may have interoperability problems.
Table 58 SIP Call Progression
A B
1. INVITE
2. Ringing
3. OK
4. ACK
5.Dialogue (voice
traffic)
6. BYE
7. OK