ZyXEL Communications NVG2053, Руководство пользователя

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Chapter 17 Voice
NVG2053 User’s Guide
171
DTMF Mode Control how the NVG2053 handles the tones that your telephone makes
when you push its buttons. You should use the same mode your VoIP
service provider uses.
RFC2833 - 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 and G.726) can
distort the tones.
SIP INFO - send the DTMF tones in SIP messages.
FAX Option This field controls how the NVG2053 handles fax messages.
G.711 Fax
Passthrough
Select this if the NVG2053 should use G.711 to send fax messages. The
peer devices must also use G.711.
T.38 Fax
Relay
Select this if the NVG2053 should send fax messages as UDP packets
through IP networks. This provides better quality, but it may have inter-
operability problems. The peer devices must also use T.38.
Outbound Proxy
Enable
Select this option if your VoIP service provider has a SIP outbound
server to handle voice calls.
This allows the NVG2053 to work with any type of NAT router and
eliminates the need for STUN or a SIP ALG.
Turn off any SIP ALG on a NAT router in front of the NVG2053 to keep it
from re-translating the IP address (since this is already handled by the
outbound proxy server).
Server Address Enter the IP address or domain name of the SIP outbound proxy server.
Server Port Enter the SIP outbound proxy server’s listening port, if your VoIP
service provider gave you one. Otherwise, keep the default value.
QoS Tag
SIP TOS Priority
Setting
Enter the priority for SIP voice transmissions. The NVG2053 creates
Type of Service priority tags with this priority to voice traffic that it
transmits.
RTP TOS
Priority Setting Enter the priority for RTP voice transmissions. The NVG2053 creates
Type of Service priority tags with this priority to RTP traffic that it
transmits.
Timer Setting
Expiration
Duration
Enter the number of seconds your SIP account is registered with the
SIP register server before it is deleted. The NVG2053 automatically tries
to re-register your SIP account when one-half of this time has passed.
(The SIP register server might have a different expiration.)
Register Re-
send timer Enter the number of seconds the NVG2053 waits before it tries again to
register the SIP account, if the first try failed or if there is no response.
Session Expires Enter the number of seconds the NVG2053 lets a SIP session remain
idle (without traffic) before it automatically disconnects the session.
Table 55 VoIP > SIP > SIP Service Provider (continued)
LABEL DESCRIPTION