Yealink SIP-T48U Administrator's Guide

Account Settings
308
l If the configured time interval is elapsed, the phone will attempt to perform a DNS query again.
l If the DNS query returns a result, the phone will use the returned record from the DNS server and ignore the stat-
ically configured cache values.
When the phone is not configured with a DNS server, it will behave as follows:
l The phone attempts to resolve the domain name within the static DNS cache.
l The phone will always use the results returned from the static DNS cache.
Static DNS Cache Configuration
The following table lists the parameters you can use to configure static DNS cache.
Parameter
account.X.dns_cache_type
[1]
<MAC>.cfg
Description
It configures whether the phone uses the DNS cache for domain name resolution of the SIP server
and caches the additional DNS records.
Permitted
Values
0-Perform real-time DNS query rather than using DNS cache.
1-Use DNS cache, but do not record the additional records.
2-Use DNS cache and cache the additional DNS records.
Default
1
Parameter
account.X.static_cache_pri
[1]
<MAC>.cfg
Description
It configures whether preferentially to use the static DNS cache for domain name resolution of the SIP
server.
Permitted
Values
0-Use domain name resolution from server preferentially
1-Use static DNS cache preferentially
Default
0
Parameter
dns_cache_naptr.X.name
[2]
<y0000000000xx>.cfg
Description
It configures the domain name to which NAPTR record X refers.
Permitted
Values
Domain name
Default
Blank
Parameter
dns_cache_naptr.X.order
[2]
<y0000000000xx>.cfg
Description
It configures the order of NAPTR record X.
NAPTR record with the lower order is more preferred.
Permitted
Values
Integer from 0 to 65535
Default
0
Parameter
dns_cache_naptr.X.preference
[2]
<y0000000000xx>.cfg
Description
It configures the preference of NAPTR record X.
NAPTR record with lower preference is more preferred.
Permitted
Values
Integer from 0 to 65535
Default
0
Parameter
dns_cache_naptr.X.replace
[2]
<y0000000000xx>.cfg

Yealink SIP-T48U Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Gray
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithms	AES, HTTPS, SRTP, TLS
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Front camera	-
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Keypad number of keys	29
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Width	226 mm
Height	185 mm