ZyXEL Communications P-2602HWNLI Support Notes page 146

common expiration time for idle SIP sessions. This field sets the shortest
expiration time that the Prestige will accept.
The Prestige checks the session expiration values of incoming SIP INVITE
requests against the minimum session expiration value that you configure
here. If the session expiration of an incoming INVITE request is less than
the value you configure here, the Prestige negotiates with the other SIP
device to increase the session expiration value to match the Prestige's
minimum session expiration value.
Real time Transport Protocol is used to handle voice data transfer. Use this
RTP Port
field to configure the Prestige's listening port range for RTP traffic. Leave
Range
these fields set to the defaults if you were not given a range of RTP ports to
use.
The Dual Tone Multi-Frequency (DTMF) mode sets how the Prestige
handles the tones that your telephone makes when you push its buttons. It
is recommended that you use the same mode that your VoIP service
provider uses.
Select RFC 2833 to send the DTMF tones in RTP packets.
DTMF Mode
Select PCM (Pulse Code Modulation) to include 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) could distort the tones.
Select SIP INFO to send the DTMF tones in SIP messages.
MWI Enable Message Waiting Indication (MWI) to have your phone give you a
(Message message–waiting (beeping) dial tone when you have a voice message(s).
Waiting Your voice service provider must have a messaging system that supports
Indication) this feature.
Use this field to set how long the SIP server should continue providing the
message waiting service after receiving a SIP SUBSCRIBE message from
Expiration
the Prestige. The SIP server stops providing the message waiting service if
Time
it has not received another SIP SUBSCRIBE message from the Prestige
before this time period expires.
All contents copyright (c) 2006 ZyXEL Communications Corporation.
P-2602HWNLI Support Notes
146