Chapter 26 Voice
VMG/EMG/AM/DM/GM Series User’s Guide
386
Transport Type
Transport Type
Select the protocol used to transport the SIP packets.
For UDP and TCP, see the Service appendix for more information on the example
services and the required protocol and port number.
For more information on TLS, see Section 26.5 on page 387.
Ignore Direct IP
Select Enable to have the connected devices accept SIP requests only from the SIP
proxy/register server specified above. SIP requests sent from other IP addresses will
be ignored.
FAX Option This field controls how the Zyxel Device handles fax messages.
G711 Fax Passthrough Select this if the Zyxel Device should use G.711 to send fax messages. You have to
also select which operating codec (G.711Mulaw or G.711Alaw) to use for encoding/
decoding FAX data. The peer devices must use the same settings.
T38 Fax Relay Select this if the Zyxel Device should send fax messages as UDP or TCP/IP packets
through IP networks. This provides better quality, but it may have inter-operability
problems. The peer devices must also use T.38.
QoS Tag
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 Fall 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.
Enable DNS SRV Select this to have the Zyxel Device query your ISP’s DNS server for a list of any
available SIP servers that it maintains. This is useful if your static SIP server experiences
difficulties, making it hard for your IP phone users to make SIP calls.
OK Click this to save your changes.
Cancel Click this to exit this screen without saving.
Table 133 VoIP > SIP > SIP Service Provider > Add New Provider or Edit (continued)
LABEL DESCRIPTION
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