Zyxel V301-T1 [115/240] Advanced setup continued

Zyxel V301-T1 [115/240] Advanced setup continued
Chapter 10 SIP Account Setup
V300 Series User’s Guide
115
Select the type of voice coder/decoder (codec) that you want the V300
to use.
G.711 provides high voice quality but requires more bandwidth (64
kbps).
G.711A is typically used in Europe.
G.711u is typically used in North America and Japan.
G.722 provides excellent sound quality and operates at 48 ~ 64
kbps.
G.726 operates at 16, 24, 32 or 40 kbps.
By contrast, G.729 requires only 8 kbps.
G.723 refers to G.723.1, which uses 5.3 or 6.4 kbps.
The V300 must use the same codec as the peer. When two SIP devices
start a SIP session, they must agree on a codec.
Primary
Compression
Type
Select the V300’s first choice for voice coder/decoder.
Secondary
Compression
Type
Select the V300’s second choice for voice coder/decoder.
Third
Compression
Type
Select the V300’s third choice for voice coder/decoder.
DTMF Mode
Control how the V300 handles the alphanumeric keypad tones. You
should use the same mode your VoIP service provider uses.
RFC 2833 - send the DTMF tones in RTP packets
PCM - send the DTMF tones in the voice data stream. This method
works best when you are using a codec that does not use compression
(like G.711). Codecs that use compression (like G.729) can distort the
tones.
SIP INFO - send the DTMF tones in SIP messages.
STUN
Enable Select this if all of the following conditions are satisfied.
There is a NAT router between the V300 and the SIP server.
The NAT router is not a SIP ALG.
Your VoIP service provider gave you an IP address or domain name
for a STUN server.
Otherwise, clear this field.
Server
Address
Enter the IP address or domain name of the STUN server provided by
your VoIP service provider.
Server Port Enter the STUN server’s listening port, if your VoIP service provider
gave you one. Otherwise, keep the default value.
Use NAT
Enable Select this if your service provider has a NAT router between your
phone and the SIP server.
Table 28 VoIP > SIP > SIP Settings > Advanced Setup (continued)
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