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Chapter 23 Voice
VMG/XMG Series User’s Guide
308
23.5 The Phone Device Screen
Use this screen to view detailed information on phones used for Internet phone calls (SIP). You can
define which phone(s) will ring when a specific SIP address receives an incoming call, and which SIP
address will be used when an outgoing call is made with a specific phone. To access this screen, click
VoIP > Phone > Phone Device.
SIP DSCP Mark
Setting
Enter the DSCP (DiffServ Code Point) number for SIP message transmissions. The Zyxel Device
creates Class of Service (CoS) priority tags with this number to SIP traffic that it transmits.
RTP DSCP Mark
Setting
Enter the DSCP (DiffServ Code Point) number for RTP voice transmissions. The Zyxel Device
creates Class of Service (CoS) priority tags with this number to RTP traffic that it transmits.
Timer Setting
SIP Register
Expiration
Duration
Enter the number of seconds your SIP account is registered with the SIP register server before it is
deleted. The Zyxel Device 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.)
SIP Register Fail
Re-try timer
Enter the number of seconds the Zyxel Device waits before it tries again to register the SIP
account, if the first try failed or if there is no response.
Session Expires
(SE)
Enter the number of seconds the Zyxel Device lets a SIP session remain idle (without traffic)
before it automatically disconnects the session.
Min-SE Enter the minimum number of seconds the Zyxel Device lets a SIP session remain idle (without
traffic) before it automatically disconnects the session. When two SIP devices start a SIP session,
they must agree on an expiration time for idle sessions. This field is the shortest expiration time
that the Zyxel Device accepts.
Dialing Interval Selection
Dialing Interval
Selection
Enter the number of seconds the Zyxel Device should wait after you stop dialing numbers before
it makes the phone call. The value depends on how quickly you dial phone numbers.
DNS SRV
Enable DNS SRV Select this to have the Zyxel Device use DNS procedures to resolve the SIP domain and find the
SIP server’s IP address, port number and supported transport protocol(s).
The Zyxel Device first uses DNS Name Authority Pointer (NAPTR) records to determine the
transport protocols supported by the SIP server. It then performs DNS Service (SRV) query to
determine the port number for the protocol. The Zyxel Device resolves the SIP server’s IP address
by a standard DNS address record lookup.
The SIP Server Port and REGISTER Server Port fields in the General section above are grayed out
and not applicable and the Transport Type can also be set to AUTO if you enable this option.
Cancel Click Cancel to restore your previously saved settings.
OK Click OK to save your changes.
Table 123 VoIP > SIP > SIP Service Provider > Add new provider/Edit (continued)
LABEL DESCRIPTION
308


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