Yealink SIP-T27G Administrator's Guide

Account Settings
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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-T27G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black, Gold
Wall mountable	Yes
Display diagonal	3.66 \
Display resolution	240 x 120 pixels
RJ-9 ports quantity	2
USB 2.0 ports quantity	1
Voice codecs	CNG, G.711, G.722, G.723.1, G.726, G.729, G.729ab, VAD, iLBC
Dual-Tone Multi-Frequency (DTMF) modes	SIP info
Lines quantity	8 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
Bluetooth	-
Security algorithms	AES, MD5
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Volume control	Digital
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	210 mm
Width	265 mm
Height	170.5 mm