Figure 81 settings: sip phone codec settings, Table 14 bandwidth preference codec ordering – ZyXEL Communications V660 User Manual
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Chapter 13 Settings
V660 User’s Guide
107
Figure 81 Settings: SIP Phone Codec Settings
FPP refers to the number of Frames Per Packet. Each frame contains a set number of digital
samples, and each audio data packet the V660 sends and receives can contain a number of
frames. Use the settings supplied by your VoIP service provider. If you are experiencing VoIP
call problems, try using a lower FPP number.
When you make a SIP call, the V660 and the SIP server negotiate which voice codec they use
for the call. The Bandwidth preference field controls the order in which the V660 tries to use
the codecs, as shown in the following table.
13.2.2.2 Advanced Settings
Select Start > Settings > WiFi > SIP Phone and either press New or highlight an existing
profile and select Menu > Edit. Scroll down to the Advanced setting section.
"
Alter these settings only if you have instructions to do so from your VoIP
service provider.
Table 14 Bandwidth Preference Codec Ordering
PREFERENCE
ORDER
High
G.711 µ-Law, G.711 A-Law, G.729, G.723 (not supported at the time of writing)
Med
G.729, G.723, G.711 µ-Law, G.711 A-Law
Low
G.723, G.729, G.711 µ-Law, G.711 A-Law